MiniARM - SPJ Systems
Contents
1. are dual function pins I e if you do not need debugging then you may use these pins as general digital I O pins Please refer to data sheets MiniARM User s Manual Page 21 of LPC21xx micro controllers for more information IO A and IO B Connectors These are 32 pin dual line headers These connectors bring out I O and most of the pins of the LPC21xx micro controller Further 5V and 3 3V are also made available on these connectors These connectors are intended for use to connect external peripherals While purchasing the MiniARM board user has the choice to ask for male or female headers Further if user selects male headers then again choice is available to have these headers soldered on the component side or on the solder side Female headers can be availed on the component side only One of the following suffixes maybe used in the product name while ordering MiniARM 21xx MA male headers on component side MiniARM 21xx MB male headers on solder side Page 22 MiniARM User s Manual MiniARM 2 1xx FA female headers on component side MA and MB are useful when you wish to use flat cables to connect external peripherals to the MiniARM board FA is especially useful when you want to mount an add on module on top of the MiniARM board SPJ Systems manufactures such add on modules like e Prototyping board with markings on rows and columns e LED jumpers board for I O simulation e More The pin signal deta2. select between Program ISP mode and RUN mode 11 MiniARM 2138 and MiniARM 2148 boards include Real Time Clock RTC with battery Please note it can maintain date and time even when power is switched off only if the RTC is initialized to correct mode of operation by software Please note LCD is NOT supplied with the MiniARM It may be purchased separately and connected to MiniARM Page 14 MiniARM User s Manual 4 Connector Details and Jumper Settings Figure 1 shows the locations of different components on the board MiniARM User s Manual BKLT2 CI C BKLT1 NOT TO SCALE PWR JACK Figure 1 MiniARM component locations Page 16 MiniARM User s Manual Description of items in Figure 1 RST Reset Push button PGM Mode selection jumper This is a set of 3 right angle pins Placing a shorting link the black cap on pins marked 1 and 2 of this jumper and restarting the board will put the LPC21xx micro controller in Program ISP mode When shorting link is placed on pins 2 and 3 and board is restarted it goes to Run mode runs user program from flash IO A and IO B I O pins connectors These are dual line connectors Pin numbers and 2 are as shown in the figure JTAG It is the connector which brings out JTAG signals of the LPC21xx micro controller LCDCON Connector for LCD Pin number 1 is as shown in the figure SERCON Serial port connector MiniARM User s Manual Page
3. signals are optionally available in SERCON connector If you need UARTI RxD and TxD at RS232 level then you must place shorting links on the jumpers marked TxD1 and RxD1 These jumpers are MiniARM User s Manual Page 19 located just above the SERCON connector CAUTION When you place shorting link on RxD1 jumper you must ensure that the 3 3V signal of RxD1 is not connected In other words you must ensure that pin 31 of connector IO A must be floating LCDCON Connector This is a 16 pin single line connector designed for connection to standard text LCD modules The pin signal correspondence is designed to be matching with that reguired by such LCD modules Pin 1 GND Pin 2 5V Pin 3 Vled Pin 4 P0 5 Used as RS of LCD Pin 5 GND Pin 6 P0 23 Used as EN of LCD Pin 7 to 10 No Connection Pin 11 to 14 P0 16 to P0 19 Used as D4 D7 of LCD Page 20 MiniARM User s Manual Pin 15 Backlighting Pin 16 GND JTAG Connector This is a 10 pin single line connector bringing out the JTAG pins of the LPC21xx micro controller Pin 1 GND Pin 2 P1 26 RTCK Pin 3 P1 26 RTCK Pin 4 P1 27 TDO Pin 5 P1 28 TDI Pin 6 P1 29 TCK Pin 7 P1 30 TMS Pin 8 P1 31 TRST Pin 9 3 3V Pin 10 GND Note The LPC21xx micro controllers have built in debug capability through JTAG port For debugging you may connect a suitable protocol converter to this connector The pins in this connector
4. words users of MiniARM 2138 must use a computer with Windows2000 NT XP and they must use ISP software version 2 2 1 Alternatively you may visit Philips web site www semiconductors philips com to see if they have another version To install the ISP software you may extract the appropriate zip file and then run SETUP EXE from the extracted files If you have wrong version of ISP software already installed then please uninstall it first and then install new version Further some computers need to be restarted after installing Page 30 MiniARM User s Manual V2 2 1 although the setup program may not necessarily prompt you to restart computer It is best to restart the computer anyway After that follow these steps for programming the flash 1 Run the ISP software 2 From the device list select appropriate device LPC2138 3 Enter crystal frequency correctly 14746 4 Keep the MiniARM board power switched off Set the jumper to ISP position Connect board to PC COM port with supplied serial cable In ISP software select appropriate COM port 6 Click on Read Device ID button Switch on power to the board only after you see the message Please reset your LPC2000 board now and then press ok Wait for a second or two and then click OK button 7 Ifallis well you will see the Part ID and Boot Loader ID displayed 8 Click on the browse button actually it is only marked as Select appropriate
5. 17 PWR JACK Power input socket TxD1 and RxD1 UARTI type select jumpers When shorting links are placed on both these jumpers it converts the second serial port UART1 of the LPC21xx micro controller into a 3 wire RS232 port If shorting links are not placed on both the jumpers then RxD1 and TxD1 signals can be used as 3 3 Volts digital signals through IO_A IO_B connectors BKLTI and BKLT2 LCD backlighting option select jumpers Together they control the way LCD backlighting will operate as described in the table below BKLTI BKLT2 LCD backlighting Open Open Always OFF Short Open Controlled by P0 7 1 backlight ON 0 backlight OFF X Short Always ON Page 18 MiniARM User s Manual The upper rectangle in Figure 1 of size 80X35 mm represents the area covered by LCD when connected LCD is not a part of the board rather it must be purchased separately if needed Connector Details SERCON Connector This is a DB9 female connector used for RS232 serial communication with the PC Pin 2 UARTO RS232 RxD input to UC Pin 3 UARTO RS232 TxD output of UC Pin 4 UART1 RS232 RxD input to UC Pin 5 Ground Pin 6 UART1 RS232 TxD output of UC All other pins of SERCON are unused UARTI RxD and TxD pins can be availed at either 3 3Volts level SV tolerant or at RS232 levels The 3 3V signals are always available in connector IO_A and RS232 level
6. HEX file A MiniARM User s Manual Page 31 You may use one of the example programs included in the SCARM software MiniARM 2138 examples can be found under the folder SCARM Examples MiniARM MiniARM 2138 9 Click on Upload to flash button 10 Uploading progress will be displayed When done close the ISP program and switch off power to the board To run user program from flash Remove shorting link from PGM jumper and restart the board If a valid user program exists in the flash it will run Pin P0 14 is also available in the connector IO_A If you have connected an external device to this connector ensure that P0 14 is not pulled low during power on If it is pulled low during power on the LPC21xx may enter ISP mode and may not run user program Page 32 MiniARM User s Manual Description of example programs As mentioned above the SCARM software includes a set of examples programs for MiniARM 2138 All these example programs are written in C and these can be compiled using evaluation version of SCARM C Compiler which is included with the board This section provides a brief description of these example programs Before that it describes an important software tool SPJTerminal which is part of SCARM SPJTerminal Terminal Emulation utility When you run the SCARM main program SIDE ARM you will see a Tools menu Under this menu there is an option SPJTerminal When you click on this opti
7. MiniARM 21xx FA board It provides visual indication of output pins status It also provides a way to simulate LOW or HIGH level to input pins It includes 42 LEDs which can be connected to P0 0 P0 31 pins and P1 16 P1 25 pins Further it also has 42 3 pin jumpers The center pin of the jumper has the signal i e one of P0 0 PO 31 P1 16 P1 25 pins Lower pin of the jumper has GND A shorting link can be used to short the bottom 2 pins of the jumper doing so will force LOW level on the corresponding port pin This is useful for simulating tristate or low level on input pins On the other hand when shorting link is placed on the upper 2 MiniARM User s Manual Page 37 pins of the jumper it connects the LED to the port pin through a suitable current limit resistor This is useful for getting visual indication of the status of output pins When the port pin is driven LOW the LED glows When port pin is HIGH or is tristated the LED stays off MA Proto board This is a prototyping board which can be mounted right on top of the MiniARM 21xx FA board It has letters or digits marked on each row and column This board is useful for building a prototype of your LPC21xx based product Due to direct connection to IO_A and IO_B connectors of the Mini ARM board the prototyping area can have access to nearly all pins of the LPC21xx micro controller Besides 5V and 3 3V signals are also available on the prototyping area sin
8. User s Manual Edition 1 4 January 2006 for MiniARM Evaluation Board Models MiniARM 2124 MiniARM 2138 MiniARM 2148 SPJ Systems 101 Beaver Grandeur Baner Road Pune 411045 INDIA Tel 91 20 27293002 Fax 91 20 27293003 http www spjsystems com Page 2 MiniARM User s Manual DISCLAIMER User s Manual and other documentation This user s manual and the accompanying documentation such as schematic diagrams in soft or hard form contains descriptions of copyrighted products which are not explicitly indicated as such The absence of the trademark symbol does not infer that a Product is not protected Additionally registered patents and trademarks are similarly not expressly indicated in these documents The information in these documents has been carefully checked and is believed to be entirely reliable However SPJ Systems assumes no responsibility for any inaccuracies SPJ Systems neither gives any guarantee nor accepts any liability whatsoever for consequential damages resulting from the use of these documents or associated product SPJ Systems reserves the right to alter the information contained herein without prior notification and accepts no responsibility for any damages that might result Additionally SPJ MiniARM User s Manual Page 3 Systems offers no guarantee nor accepts any liability for damages arising from the improper usage or improper installation of the hardware or software SPJ Syst
9. al second pin in this jumper is GND Thus when you place a shorting link on pins 1 2 of this jumper the PO 14 pin is short circuited with GND This will force the boot load program to go to ISP mode On the other hand if the shorting link is removed then PO 14 pin stays high due to an on board pull up resistor This forces the boot load program to pass control to the user program provided other necessary conditions are satisfied As a summary To program the flash Place shorting link on pins 1 2 of PGM jumper and restart the board This will put the LPC21xx micro controller in ISP mode Then run appropriate version of LPC2000 ISP software The CD you received with this board contains evaluation version of SCARM C Compiler for ARM When you install it you will see the folder SCARM Utilities This folder contains 2 zip files Ipc2000 flash utilityV2 2 0ForAllWindows zip and lpc2000 flash utilityV2 2 1ForWinNT 2K XP zip Both these have been downloaded those from Philips Semiconductor web site and they have MiniARM User s Manual Page 29 allowed us to include these on our CD The first zip file contains ISP software Version 2 2 0 which runs on Windows98 ME 2000 NT XP The second zip file contains ISP software Version 2 2 1 which can install and run only on Windows2000 NT XP V2 2 0 supports LPC2104 so it is useful for customers of MiniARM 2104 LPC2138 is only supported by V2 2 1 but it runs only on WindowsNT 2000 XP In other
10. at you use only the supplied cable for connecting to MiniARM board If you must use another cable be sure that it has only 3 wires in it Further it must have DB9 female connector on one end PC end and DB9 male connector on another end MiniARM end The 3 wires in the cable must be connected as DB9Female Pin5 gt DB9Male Pin5 DB9Female Pin2 lt gt DB9Male Pin3 DB9Female Pin3 lt gt DB9Male Pin2 If you need to use both serial ports of MiniARM You should connect the Y splitter to the DB9 connector on MiniARM The other 2 ends of the Y are marked as 0 and 1 to indicate UARTO and Page 10 MiniARM User s Manual UARTI UART0 is used for programming the MiniARM board so you may connect the supplied serial communication cable to the 0 end of Y The other end of this cable should be connected to COM1 or COM2 of your PC The 1 end of Y maybe used to connect to any other device or another PC you will need to buy or make another cable to connect here If you don t need to use the second serial port In this case you may not use the Y splitter at all You may directly connect the serial communication cable to the DB9 connector of MiniARM As usual the other end of this cable should be connected to COM1 or COM2 of your PC Powering ON After connecting the serial communication cable as described above you may insert the power adaptor output jack into the on board power socket Plug t
11. ce these signals are available on IO A and IO B connectors NOTE 5V has only 100 mA spare capacity and 3 3V has only 50 MA spare capacity Page 38 MiniARM User s Manual LCD module The MiniARM board has been specially engineered for easy LCD connection 16 char X 2 rows text LCD module can be mounted directly on the MiniARM board The board also provides appropriate mounting holes so the LCD can be fixed to the MiniARM board with simple screw arrangement Due to the direct connection no cable is reguired Wooden Enclosure This is a simple wooden box very convenient for mounting the MiniARM and accessories If you buy MiniARM with this wooden box the MiniARM board is fitted with screws inside the box In order to use the board the box must be kept open and then you may connect serial cable and power jack This enclosure also has sufficient space for accommodating the MA LED MA Proto or similar add on module and 16X2 LCD module If you buy MiniARM LCD MA LED board MiniARM User s Manual Page 39 Wooden Enclosure from SPJ then all the above will be fitted inside the Enclosure serial cables power adaptor and software CD will be outside it Page 40 MiniARM User s Manual 7 MiniARM Applications The MiniARM evaluation board is designed to be used in many different configurations Some of them are described here 1 As a test platform for your ARM applications Using the default configuration you can downl
12. ems further reserves the right to alter the layout and or design of the hardware without prior notification and accepts no liability for doing so SPJ Systems 101 Beaver Grandeur Baner Road Baner Pune 411045 India Phone 91 20 27293002 Fax 91 20 27293003 Email spj spjsystems com Web Site http www spjsystems com Page 4 MiniARM User s Manual Table of Contents 1 INERODUCT ON sisssiscssesascenssssssevensesvoccesscssvancssosvesscesnesses 6 2 GETTING STARTED eooooocroooooooooooo o o o o o oooo 8 Del UNPACKING pe BAE PEN SNN Bun 8 2 2 POWER SUPPLY REQUIREMENTS oom 8 2 3 CONNECTING THE SYSTEM nana 9 If you need to use both serial ports of MiniARM 9 If you don t need to use the second serial port 10 POWOTING ON Ge entesenten ce sig ies cae shies ae Sudan 10 3 HARDWARE DESCRIPTION oooooooooooooooooooooo 12 SPECIFICATIONS OF MINIARM 2124 MINIARM 2138 amp MINIARM 2148 BOARDS ccceceesessscecececeesenteceeeeeceeseees 12 4 CONNECTOR DETAILS AND JUMPER SETTINGS OE EEIEIIE EEE 14 DESCRIPTION OF ITEMS IN FIGURE 1 Lo oom 16 RS Tee Pan eae eek secs hse aides ae eee na 16 PGMS Sanches teh Ses Mah chy ihc PA At Aha cit hed ohh 16 TO_A and IO B5 inii nnnnnn none 16 A pe AN na Na non ena ee 16 BEDEON Lele EN iia nad ak Masia eke 16 SERCON ee Pnb nti vette Bee aaa ieee 16 PWRJACGK be esteaanag usang 17 MiniARM User s Manual Page 5 TxDI and RXDI isesi ene
13. he power adaptor into 230VAC mains outlet and turn it on The power on indication Red LED will turn on MiniARM User s Manual Page 11 CAUTION Please do not connect or disconnect the serial communication cable while the board is powered ON Doing so can damage the serial port of the MiniARM board and or PC Page 12 MiniARM User s Manual 3 Hardware Description Specifications of MiniARM 2124 MiniARM 2138 amp MiniARM 2148 boards 1 2 3 4 5 6 1 LPC2124 LPC2138 LPC2148 14 7456 MHz Operating speed up to 58 9824 MHz using on chip PLL LCD interface circuit with 16 pin connector for connecting text LCD module Two Serial Ports with a combined 9 pin connector and a serial communication cable to connect to PC The primary serial port UARTO is available as RS232 3 wire port The secondary serial port UART1 can be either RS232 3 wire or 3 3V digital port SV tolerant Regulators to supply 5V 3 3V 1 8V to the board DC adaptor 230 VAC input 9 VDC output 50 mA which can be directly connected to the board CD ROM containing MiniARM User s Manual Page 13 a Evaluation version of SPJ Systems SCARM C Compiler for ARM b Sample programs to access LCD serial port RTC etc c LPC2000 ISP software courtesy of Philips Semiconductors 8 Unused optionally used port pins are available on convenient connectors 9 Push button to reset the micro controller 10 Jumper to
14. ils of IO_A and IO_B are as below IO_A Pin Signal name 1 PO 15 RI1 EINT2 AD1 5 3 P0 14 DCD1 EINT1 SDA1 5 P1 22 PIPESTATI 7 P0 13 DTR1 MAT1 1 AD1 4 9 P0 12 DSR1 MAT1 0 AD 1 3 11 PO 10 RTS1 CAP1 0 AD1 2 13 P1 20 TRACESYNC MiniARM User s Manual Page 23 15 17 19 21 23 25 27 29 31 2 4 6 8 10 12 14 16 18 20 22 24 P1 24 TRACECLK PO 16 EINTO MAT0 2 CAPO0 2 P1 25 EXTINO PO 19 MAT1 2 MOSI1 CAP1 2 P0 22 AD1 7 MCAPO0 0 MATO 0 P1 18 TRACEPKT2 P1 17 TRACEPKTI P0 8 TxD1 PWM4 AD1 1 P0 9 RxD1 PWM6 EINT3 GND GND 5V P1 19 TRACEPKT3 PO 11 CTS1 CAP1 1 SCL1 P1 23 PIPESTAT2 P1 21 PIPESTATO P0 20 MAT1 3 SSEL1 EINT3 PO 17 CAP1 2 SCK1 MAT1 2 PO 18 CAP1 3 MISO1 MAT1 3 P0 21 PWMS AD1 6 CAP1 3 P0 0 TxD0 PWM1 Page 24 MiniARM User s Manual 3 3V P1 16 TRACEPKTO GND GND Signal name PO 7 SSELO PWM2 EINT2 P0 6 MOSI0 CAP0 2 AD1 0 PO 5 MISOO MATO 1 AD0O 7 P0 4 SCKO CAPO 1 AD0 6 P0 3 SDA MAT0 0 EINT1 PO 2 SCL CAPO 0 PO 1 RxDO PWM3 EINTO P0 31 V18_1 P0 30 AIN3 EINT3 CAP0 0 PO0 29 AIN2 CAPO 3 MAT0 3 PO0 28 AIN1 CAPO 2 MATO 2 PO 27 AINO CAPO 1 MATO 1 PO0 26 ADO SIN C P0 25 AD0 4 AOUT PO 24 2124 P0 23 MiniARM User s Manual 2 4 6 8 10 12 14 16 18 20 22 24 26 28 30 32 GND GND 5V 5V GND GND GND 3 3V 3 3V GND GND GND 5V 5V GND GND Page 25 Note1 Many pins have multiple functions hence the signal names include many options se
15. le do not touch any conducting part on the board including any component or connector pins as this may damage parts of the board permanently If you must touch any of the parts make sure to discharge yourself to MiniARM User s Manual Page 7 earth Parts damaged due to ESD are not covered by the limited warranty Page 8 MiniARM User s Manual 2 Getting Started 2 1 Unpacking You will find following items in the package MiniARM board Serial communication cable crossed Y splitter Power adaptor with cable e SPJ Systems CD ROM Power adaptor is included only if the board is shipped in India If the board is shipped to any country other than India only a power jack with a pair of red and black wires is supplied The user is required to provide nominal 9VDC supply across the 2 wires Red positive Black negative This supply voltage maybe in the range 8 to 11 VDC 2 2 Power Supply Requirements The power adaptor works with 230Volts AC It produces approximately 9 Volts DC and the MiniARM uses on board regulators to provide 5 Volts 3 3Volts and 1 8Volts DC to all components on the board MiniARM User s Manual Page 9 2 3 Connecting the system The serial communication cable supplied with the board should be used to connect the board to a PC running Windows95 98 NT XP ME 2000 Operating System This cable uses only 3 wires and connections of pins 2 and 3 are crossed Usually we would recommend th
16. oad your program HEX file into the on chip flash memory of the uC and run it Since the board provides JTAG pins on a connector debugging is easily possible with the help of debugger software on PC The sample programs provided with the MiniARM evaluation board include programs to interface with LCD etc Thus you can connect the required peripherals externally and have your application ready in a short time To quickly implement prototype of any product The MA Proto add on module is especially useful for this purpose MiniARM User s Manual Page 41 5 As an experimenting platform for self learning or for training Again the MA Proto add on module is handy for experimenting Students may find it especially useful for implementing their projects
17. on the SPJTerminal program opens It is a simple terminal emulation program Select Port Settings from it s menu to set the COM port setting appropriately 19200 baud 8 data bits 1 stop bit echo OFF no parity Then select Port Open from menu to open the COM port Now any characters received by the computer over the selected COM port will be displayed in the main window of SPJTerminal program Also any MiniARM User s Manual Page 33 characters you type will be transmitted by the PC over the same COM port NOTE The ISP flash utility and SPJTerminal program both use COM port of PC However Windows does not allow more than one programs to use the same COM port at the same time As a result these 2 programs can t run simultaneously You must close ISP utility before you start SPJTerminal and vice versa MiniARM 2138 Example programs 1 Hello Transmit Hello to UARTO and then echo characters Before running this program connect the MiniARM board to PC COM port and have SPJTerminal running with appropriate setting When you switch on power to the board you should see Hello appearing in the main SPJTerminal window Then if you type any key you should see the same character appearing in SPJTerminal window because the board echoes it Page 34 MiniARM User s Manual Hellol This is same as Hello except that it uses UARTI instead of UARTO Hence to test this program you will need to use the Y spli
18. parated by l For details please refer to LPC21xx data sheets Page 26 MiniARM User s Manual Note2 Signal names enclosed in curly braces are available only in MiniARM 2138 Mini ARM 2148 Note3 Some signal names are enclosed in sguare brackets These are the signals available in MiniARM 2124 model For example pin 25 of IO B is named as P0 26 ADO SIN C It means this pin is N C not connected in MiniARM 2124 The same pin has other signals P0 26 ADO 5 in case of MiniARM 2138 MiniARM 2148 MiniARM User s Manual Page 27 5 Running user programs on MiniARM The LPC21xx micro controllers include on chip flash for storing user program and non volatile data The LPC2124 on MiniARM 2124 has 256KBytes flash the LPC2138 LPC2148 on MiniARM 2138 MiniARM 2148 have 512KBytes flash This flash is In System Programmable ISP The LPC21xx micro controllers have a built in boot load program Upon power on this boot load program takes control it passes control to the user program if pin PO 14 is HIGH and some other conditions are satisfied Please refer to the LPC21xx data sheet for further details On the MiniARM board the P0 14 pin is made available on a jumper marked PGM just below the RST push button please refer to Figurel Right angle pins have been used for this jumper so that it can be accessed from the side even when an LCD is mounted on top of the MiniARM board The Page 28 MiniARM User s Manu
19. sis aissei 17 BKLTI and BKLT2 winner m mna 17 CONNECTOR DETAILS oo ian 18 SERCON Connector woo 18 LCDCON Connector en ono 19 JTAG Conn cto Hen banana 20 TO_A and IO B COMMECTOFSI oo 21 5 RUNNING USER PROGRAMS ON MINIARM 27 TO PROGRAM THE FLASH we nenen nenen ente ena 28 TO RUN USER PROGRAM FROM FLASH cceeeeeseeeeeeceesenees 31 DESCRIPTION OF EXAMPLE PROGRAMS ooooWocooo 32 SPJTerminal Terminal Emulation Utility 32 MiniARM 2138 Example Programs ooo 33 6 OPTIONAL ACCESSORIES OF MINIARM 36 MATTED BOARD 526 KANAN SNN Na 36 MA PROTO BOARD scsesssceeececsessseeecececsessaseeeeeeesentaeees 37 LED MODULE Fives sn been E E una 38 WOODEN ENCLOSURE ooooo nenen 38 7 MINIARM APPLICATIONS woo 40 Page 6 MiniARM User s Manual 1 Introduction This is user s manual for MiniARM 2124 MiniARM 2138 and MiniARM 2148 Evaluation Boards based on LPC2124 LPC2138 and LPC2148 micro controllers respectively This is a general purpose board designed as a development tool this board has a facility to download user programs into the on chip flash memory of the micro controller It is strongly recommended to read this manual carefully before you start using the MiniARM CAUTION This board contains components that are sensitive to Electro Static Discharge ESD The board must be handled carefully so as not to subject it to ESD As far as possib
20. tter and connect UARTI of board to COM port of PC HelloLCD This similar to Hello but it additionally displays the Hello string on LCD and also echoes characters to LCD SquareWave Produces a squarewave at PO 15 i e pin 1 of connector IO A FastSquareWave Produces a squarewave at P0 15 i e pin 1 of connector IO_A This is much faster squarewave because it uses PLL multiplier and MAM LEDRing Turns on LEDs connected to PO and PI pins one after the other cyclically The best way to test this program is to have the MA LED board mounted on MiniARM 2138 and then switch on power There are 42 LEDs on the MA LED board All of them turn on one at a time except the one corresponding to P0 24 This is because the MiniARM User s Manual Page 35 signal P0 24 is simply not available on LPC2138 pins 7 Clock Uses on chip RTC battery powered and displays date time on LCD as well on UARTO serial port i e can be seen in SPJTerminal window if board is connected to PC However at power on it waits to receive char from serial port If this char is S then it will allow user to set the clock via serial port If it is any other char it simply starts displaying the time updates every second Page 36 MiniARM User s Manual 6 Optional Accessories of MiniARM This chapter describes optional accessories of the MiniARM evaluation board MA LED board This is an add on board which can be mounted right on top of the
Download Pdf Manuals
Related Search