M16C/26 APPLICATION NOTE Firmware Requirements for In
Contents
1. CENESAS APPLICATION NOTE M16C Firmware Requirements for In Circuit Debugger 1 0 Abstract The USB Monitor is a low cost compact interface that has two functions for Renesas M16C Flash microcontrollers 1 an in circuit debugger tool with KD30 Debugger and 2 an in system programmer with FoUSB Flash over USB Flash Programmer The following article introduces the target MCU resources used when the USB Monitor is used for in circuit debugging 2 0 Introduction When used with KD30 the USB Monitor provides an easy to use in circuit debugging environment during application development In addition when used with the FoUSB Flash Programmer it also provides an in system programming interface to the target Renesas M16C Flash MCU The USB Monitor by taking advantage of Universal Serial Bus USB provides plug and play connectivity and fast data transfers between the computer and the M16C target board The USB Monitor is powered by Renesas M37641 full soeed USB Flash MCU which also makes it upgradeable to support future Renesas M16C MCUs Powering the USB Monitor is user selectable USB Bus powered or Target powered When used in bus powered mode the USB bus supplies power to the USB Monitor and target board When in target powered mode USB bus power is disconnected and the USB Monitor sources power from the M16C target board Renesas recommends to use Target Power Mode and NOT USB Bus Power Mode when connected to non Renesas S2. processing required to be able to use it as long as the user understands the exceptions and follows the rules described below Note These resources are ONLY used when the USB Monitor is used for in circuit debugging Only the MCU pin resources are used when the USB Monitor is used for in system programming 3 1 ROM The ROM monitor code is located in the M16C memory space starts at address OFF9OOH to OFFE80H KD30 will display a message on any attempt to overwrite specified ROM location Rules on ROM usage are described below e User memory allocated to the ROM monitor should not be used Any attempt to use this area by the user code will be ignored e The special page vector table is mapped from OFFEOOH to OFFFDBH It is suggested that if special page jumps are used the special page numbers start with the minimum value of 20 and increases to a maximum of 127 to accommodate future monitor size increases 3 2 RAM The ROM monitor utilizes 128 bytes of RAM memory located at the top of MCU RAM area For example on an REU05B0028 0100Z June 2003 Page 2 of 7 M16C a gE N ESAS Firmware Requirements for In Circuit Debugger M30624 MCU there is 20Kbytes of RAM located from 00400H to O53FFH In this case the monitor will be using the addresses from 05380H to 053FFH In addition the monitor also uses 4 bytes max of RAM on the interrupt stack 3 3 Interrupts For all MCU s that do NOT support DBC interrupt the ROM monitor requi
3. 00Z June 2003 Page 5 of 7 M16C a gE N ESAS Firmware Requirements for In Circuit Debugger 6 0 Software Code Startup File Examples for USB Monitor Support for Debugging Operations MCU with NO DBC support Following is a simple program written for Renesas NC30 compiler to illustrate how to set up Pulse Output Mode on timer AO 6 Software Code Startup File Examples for USB Monitor Support for Debugging Operations MCU with NO DBC support A startup file ncrt0 a30 example for the M16C 10 M30102 MCU with global interrupt enabled and highlighted is shown below For M16C MCU s with DBC interrupt the global interrupt need not be enabled unless the application requires the use of maskable interrupts pt kkkkkkkkkkkkkkk kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk C COMPILER for M16C 10 with USB Monitor support Copyright 2003 Renesas Technology America Inc j All Rights Reserved nert0O a30 NC30 startup program for M16C 10 devices i This program is applicable when using the basic I O library Id ncrt0 a30 v 1 12 2000 05 18 06 44 37 simomura Exp This startup program is setup for use with the USB Monitor Source code ROM area is from 0xFA000 to OxFF800 22 5K bytes Available ram memory is from 0x400 0x770 880 bytes Heap memory area is zeroed out If using standard libraries heap memory area will have to be specified UARTO is used by the USB MONITOR and is not available f
4. KP target boards If you plan to use the USB Monitor to supply power to non SKP boards please contact Renesas representative for details and assistance Aside from a standalone kit RTA FOoUSB MON the USB Monitor comes included with the following Renesas Starter Kits e MSV30102 SKP e MSV30262 SKP e MSV30245 SKP e M16C System Evaluation Kit REU05B0028 01002Z June 2003 Page 1 of 7 M16C a gE N ESAS Firmware Requirements for In Circuit Debugger PC with Windows 98 2000 Me Custom Target Board RT4 FoUSB MON ee a ee Pam STATUS 10 Pin RTA FOUSB MON n Connection USB Figure 1 USB Monitor System Connectivity 3 0 Target MCU Resources Used by USB Monitor for In Circuit Debugging This section describes the M16C MCU resources used by the USB Monitor for in circuit debugging with the KD30 Debugger These resources are NOT used when the USB Monitor is used for programming with the FoUSB Programmer See references for details on how to connect the hardware for in circuit debugging or in system programming support When used as debug interface the USB Monitor downloads a small program called a ROM Monitor or MCU Monitor Image MMI to the target M16C MCU to establish communications used for program debugging operations This ROM Monitor is downloaded to the target when KD30 application is started It is important to note that the operation of the USB Monitor is transparent to the user There is no special software
5. d direction register to avoid interfering with monitor operation associated with the boot SIO UART Use bit manipulations e Do NOT change boot UART configuration e Ensure that the boot SIO UART vector is properly setup to point to FF900H for those M16C MCU s that don t have DBC interrupt e Do NOT attempt to debug watchdog WAIT mode or STOP mode e Do NOT execute a STEP operation after a write to PRC2 SFR 4 0 Conclusion The USB Monitor is an easy to use interface for setting up an M16C MCU development environment to support in circuit debugging It does not require a lot of resources from the target board Correct hardware connectivity will guarantee proper operation REU05B0028 0100Z June 2003 Page 4 of 7 M16C a gE N ESAS Firmware Requirements for In Circuit Debugger 5 0 Reference Most of the information used to make this application note can be found on the USB Monitor s Users Manual For detailed information about the USB Monitor such as application software driver installation troubleshooting etc please refer to the Users Manual If unsure or to verify your hardware setup contact your Renesas representative for assistance Renesas Technology Corporation Semiconductor Home Page http www renesas com E mail Support support _apl renesas com User s Manual e RTA FOoUSB MON User s Manual e Target Setup for FOUSB Programmer App Note e Target Setup for In Circuit Debugger App Note REU05B0028 01
6. g product data diagrams charts programs and algorithms represents information on products at the time of publication of these materials and are subject to change by Renesas Technology Corporation without notice due to product improvements or other reasons It is therefore recommended that customers contact Renesas Technology Corporation or an authorized Renesas Technology Corporation product distributor for the latest product information before purchasing a product listed herein The information described here may contain technical inaccuracies or typographical errors Renesas Technology Corporation assumes no responsibility for any damage liability or other loss rising from these inaccuracies or errors Please also pay attention to information published by Renesas Technology Corporation by various means including the Renesas Technology Corporation Semiconductor home page http www renesas com When using any or all of the information contained in these materials including product data diagrams charts programs and algorithms please be sure to evaluate all information as a total system before making a final decision on the applicability of the information and products Renesas Technology Corporation assumes no responsibility for any damage liability or other loss resulting from the information contained herein Renesas Technology Corporation semiconductors are not designed or manufactured for use in a device or system that is used under c
7. ircumstances in which human life is potentially at stake Please contact Renesas Technology Corporation or an authorized Renesas Technology Corporation product distributor when considering the use of a product contained herein for any specific purposes such as apparatus or systems for transportation vehicular medical aerospace nuclear or undersea repeater use The prior written approval of Renesas Technology Corporation is necessary to reprint or reproduce in whole or in part these materials If these products or technologies are subject to the Japanese export control restrictions they must be exported under a license from the Japanese government and cannot be imported into a country other than the approved destination Any diversion or reexport contrary to the export control laws and regulations of Japan and or the country of destination is prohibited Please contact Renesas Technology Corporation for further details on these materials or the products contained therein
8. or application Modified for use in Mini 10 Board development eRRKKKK KKK KKK KKK KEKEKKKEKER EKER EEE KK KKK KKK KKK KEKEKEKEKEKEKEKEKEKEEEKE KEK KKEKKKKKKKKKKKKKKEKKKK dec data_ SE top sb set sb stack base register ldintb VECTOR_ADR fset 1 enabling interrupts Do NOT disable interrupt when using USB Monitor N BCOPY data NOI top data_NO top data_NO REU05B0028 0100Z June 2003 Page 6 of 7 M16C a gE N ESAS Firmware Requirements for In Circuit Debugger An example of a sect30 inc file for the M16C 10 where the SIO UART receive interrupt vector points to the ROM monitor FF900h is shown highlighted below For M16C MCU s with DBC interrupt the vector declaration is not required pt kkkkkkkkkkkkkk kkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkkk C Compiler for M16C 10 Copyright 2003 Renesas Technology America Inc All Rights Reserved Written by T Aoyama sect30 inc section definition This program is applicable when using the basic I O library SId sect30 inc v 1 9 2000 06 20 09 07 11 simomura Exp eRRKKKKKEKEK KKK KKEKEKEKEKEKEEKEKE ERE KEE KKK KK KK KKK KEKEKEKEKEKEKERKE EERE KEKE KK KKK KK KKKEKEKEKEKEKKEEKEEKEKEEK KE lword dummy int Software INT 15 lword dummy_int Software INT 16 lword dummy int uartO transmit for user vector 17 lword OFF900h uartO receive for user vector 18 For USB Monitor DO NOT CHANGE lword dummy int uar
9. res that the receive interrupt vector for the monitor boot UART MUST point to the communications entry point of the monitor which is OFF9OOH In addition the monitor reserves the following hardware interrupt vectors for its own use e BREAK vector OFFFE4H e ADDRESS MATCH vector OFFFE8H e SINGLE STEP vector OFFFECH e DBC vector OFFFF4H The user code download process will properly load values into these locations User code that globally disables interrupts for long periods of time gt 1 second may interfere with the proper operation of the monitor Note For MCU s that do NOT have DBC interrupts always ensure that the global interrupt is enabled in the startup files Communications between USB Monitor and M16C MCU ROM Monitor will fail when the global interrupt is not set or disabled for long periods gt 1s This is the primary cause of communication errors while using the KD30 Debugger Table 1M16C MCU Support Summary 3 4 Peripherals The ROM monitor uses the serial port associated with the boot mode of the MCU for communication with the USB Monitor Connect the SCLK TxD RxD signals from the 10 pin header to this serial port For example in the case of M30624 MCU the monitor uses UART1 as the boot UART For MCU s that do NOT support DBC ensure that the interrupt vector for this serial port UART is set to FF900h Avoid byte writes to the boot UART SIO port including direction register associated with the SIO when
10. the other half of the port is used as General Purpose I O GPIO pins Byte writes to the port and direction register REU05B0028 0100Z June 2003 Page 3 of 7 M16C a gE N ESAS Firmware Requirements for In Circuit Debugger may prevent the monitor program from functioning properly Use read modify write instructions instead If possible avoid using this serial port for other applications in the firmware when USB Monitor will be used for development 3 5 Real Time Capability Please be aware that while the ROM monitor is in its STOP ed state the hardware peripherals will continue to run Therefore interrupts may not be serviced properly Also the watchdog timer will not be serviced and will likely timeout if active Note While the ROM monitor is in its RUN ning state there is no overhead on the application code UNLESS a RAM monitor window is open in KD30 This window requires periodic communication with the MCU This communication suspends normal application operation while servicing the request approximately 2000 BCLK cycles for each 16 bytes of data displayed in the window are used per window update The user must determine whether or not this behavior is acceptable 3 6 Software Summary and Precautions e Ensure that global interrupt is set in the startup file and not disabled for long periods gt 1s e Do NOT use the RAM or ROM memory as specified in sections 3 1 ROM and 3 2 RAM e Avoid byte writes to the port an
11. tl transmit for user vector 19 Lword dummy int uartl receive vector 20 lword dummy_int Tamer Interrupt vector 21 lword dummy_int TimerX Interrupt vector 22 REU05B0028 0100Z June 2003 Page 7 of 7 Keep safety first in your circuit designs Renesas Technology Corporation puts the maximum effort into making semiconductor products better and more reliable but there is always the possibility that trouble may occur with them Trouble with semiconductors may lead to personal injury fire or property damage Remember to give due consideration to safety when making your circuit designs with appropriate measures such as i placement of substitutive auxiliary circuits ii use of nonflammable material or iii prevention against any malfunction or mishap Notes regarding these materials These materials are intended as a reference to assist our customers in the selection of the Renesas Technology Corporation product best suited to the customer s application they do not convey any license under any intellectual property rights or any other rights belonging to Renesas Technology Corporation or a third party Renesas Technology Corporation assumes no responsibility for any damage or infringement of any third party s rights originating in the use of any product data diagrams charts programs algorithms or circuit application examples contained in these materials All information contained in these materials includin
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