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XR21B1411 USER`S MANUAL

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1. Po Pull Up Enabled ki Pull Up Disabled g Pull Up Grayed kd Pull Down Enabled Fo Pull Down Disabled g Pull Down Grayed DI Interrupt Enabled gl Interrupt Disabled g Interrupt Grayed D Active Low D Active High BI Output Pin Editable Storage GPIOO RIA GPIO1l CD GPIO2 DSR GPIOZ DTR s Input Pin Editable DN Output Pin Locked B input Pin Locked DI Default Logic Level High Editable DI Default Logic Level Low Editable DI Default Logic Level Disabled REV 1 0 0 Interface Power GPIO Pin Configuration GPIO Mode W Auto RTS CTS H Flow Control 8 Auto DTR DSR Hu Flow Control Half Duplex XC VR Enable RS 485 G Fetive High amp Fetive Low Manage Design Configuration Files Check Design O Allow configuration to be viewed by Exar ORs dr m will de vented corfokrtinly anci wiit only be iseto ingo Stee kale Load an Existing Design Browse Load Design Contact Tech Support In this mode GPIO3 GPIO0 can still be configured as described in Section 2 1 Configuring the GPIO pins in GPIO Mode on page 1 Powering XR21B1411 USER S MANUAL REV 1 0 0 WEB CONFIGURATION TOOL USER S MANUAL 2 3 Configuring the GPIO Pins in Auto DTR DSR Flow Control Mode Auto DTR DSR Flow Control Mode is similar to Auto RTS CTS Flow Control Mode In this mode GPIO3 DTR is configured as an output and GPIO2 DSR is configured as an input and their direction can
2. q Powering Connectivity REV 1 0 0 XR21B1411 USER S MANUAL WEB CONFIGURATION TOOL USER S MANUAL CEAR fio LAB Communications Networking Home About Us News Careers Storage Exar XR21B1411IL16 Enhanced 1 Ch Full Speed USB UART useo 15 k 3SN3S SNA EI 8 GPIOORIE GPIO1 CD 6 GPIOZOSR GPIOWDTR yYSaMOdMO1 Pol Pull Up Enabled ki Pull Up Disabled EJ Pull Up Grayed kd Pull Down Enabled Fa Pull Down Disabled g Pull Down Grayed SLwSOldd HI Interrupt Enabled HI Interrupt Disabled E Interrupt Grayed el Active Low oO Active High BI Output Pin Editable SLOPOIdS gt RI input Pin Editabie DN Output Pin Locked Ki Input Pin Locked DI Default Logic Level High Editable D I Default Logic Level Low Editable EI Default Logic Level Disabled Investors Contact Quality PartnerNet Welcome Interface Power GPIO Pin Configuration ce GPIO Mode O Auto RTS CTS HW Flow Control O Auto DTR DSR HW Flow Control C Half Duplex XCYR Enable RS 485 C Fetive High Cc Fetive Low Manage Design Configuration Files Check Design L Allow configuration to be viewed by Exar Gts iefomantion will be eatea corfioertiniy ancwit oniy be eco Zeene Site oeda oad an ing Design Browse Load Design Contact Tech Support XR21B1411 USER S MANUAL N R gt WEB CONFIGURATION TOOL USER S MANUAL REV 1 0 0 TABLE OF CONTENTS
3. VO ed CATTEAU aaia 2 0 GPIO PIN CONFIGURATIONS csccncessensesnccsscnsensensennennenscencensensensecnennesscensensensensennansesssensensennenssenses 2 1 CONFIGURING THE GPIO PINS IN GPIO MODE 1 0sseesseescencecnnenancenecsensusesnnensenencesansansesessnenneecesenaeessessasens 2 1 1 CONFIGURING GPIO INPUTS c cccsssceesssseesssseeesseeesesseeeeesseeeessaeeesesanes 2 1 1 1 ENABLING INTERNAL PULL UP OR PULL DOWN RESISTORS 2 1 1 2 ENABLING GPIO INTERRUPTS s1ccccccsssssnnrssceesessnnsscneessesnsssnecenens 2 1 2 CONFIGURING GPIO OUTPUTS sccisnsescscsevesszces cancosteveceicaseceeassetcedudacensescees cabeetvaccanssvecitexseasdavssaeasics 2 2 CONFIGURING THE GPIO PINS IN AUTO RTS CTS FLOW CONTROL MODERNER EEN 6 2 3 CONFIGURING THE GPIO PINS IN AUTO DTR DSR FLOW CONTROL MODERNER EEN 7 2 4 CONFIGURING THE GPIO PINS IN AUTO HALF DUPLEX TRANSCEIVER ENABLE MODE 1 ccc1e0sesse000 8 3 0 USB CONFIGURATIONS wi isisecedissinaicctabesiscacadedanisiedaceasbisiacisuausinavianasondshsndsecduavisadeassnvavnsacdeuabsanciaieeabanaaNiaee 9 3 1 ENTERING A VALID VENDOR ID AND PRODUCT ID 1 sossessseenecnncensecnecseeseasesnenneensecnaceseasennenssenenecaeesneess 9 3 2 USB MANUFACTURER PRODUCT SERIAL NUMBER STRING 1 1sscccccccncencnnecseseaseeneenneneneeenenseesneees 10 Z2REMOTEWAKESHRSDPRRORT degt NENNEN ENNEN ANNER 10 3 4 SELECTING THE POWER MODE cccccccecescssscesencsecenensucesecsccusensseneneesserscensecuscesersecess
4. nel UART Configuration Core Clock USBD GPIO1N CD C vue C 12 Nhe C 24 ihz GPIO2 DSR As Vo Baud Rate a600 hax 12000000 Baud Data Bits Stop Bits Parity Q None VBUS GPIOVOTR C werk C Space Die 2 Even C Odd S1W S0id9 S1LJ OldO gt K HIMOdMOI Manage Design Configuration Files Check Design E Allow configuration to be viewed by Exar Grts infomation will be beaten corfioeriiniy arch Wi only be usedto ingore future bag ki Pull Up Enabled DI Interrupt Enabled B Input Pin Editable FJ Pull Up Disabled Interrupt Disabled D Output Pin Locked EP Up Grayed D Interrupt Grayed B input Pin Locked kd Pull Down Enabled D Active Low DI Default Logic Level High Editable Load an Existing Design Browse Load Design Contact Tech Support Pa Pu Down Disabled D Active High DI Default Logic Level Low Editable Elsa Down Grayed BB Output Pin Edeabiey DI Defauk Logic Level Disabled 11 XR21B1411 USER S MANUAL WEB CONFIGURATION TOOL USER S MANUAL REV 1 0 0 4 1 Selecting the Core Clock Frequency The available core clock frequencies are 6 MHz 12 MHz 24 MHz and 48 MHz The selection of the core clock frequency will affect the maximum baud rate and the power consumption The maximum baud rate can be calculated by dividing the core clock frequency by 4 m 6 MHz core clock frequency gt 1 5 Mbps maximum baud rate m 12 MHz core clock frequency gt 3 Mb
5. Low VSS 4 8 GPIOO RIF Manage Design Configuration Files USBD GPIO1N CD Check Design D Allow configuration to be viewed by Exar OP ts iefonation ail de vested covfokviia y arc aii only de usedto eo dree ao GPIO 222 2 Ir GPIO0 i USBO a 6 GPIO2Z OSR Load an Existing Design Browse Load Design Contact Tech Support VBUS GPIOVOTR g H r z 9 2 E 5 5 3 S z SI g m v v a ab Po Pull Up Enabled DI Interrugt Enabled Ki Input Pin Editable ki Pull Up Disabled Interrupt Disabled DN Output Pin Locked EJ Pull Up Grayed EI interrupt Grayed Ki Input Pin Locked kd Pull Down Enabled D Active Low DI Default Logic Level High Editable kd Pull Down Disabled el Active High D I Getaut Logic Level Low Editable g Pull Down Grayed is Output Pin Editable E Default Logic Level Disabled XR21B1411 USER S MANUAL WEB CONFIGURATION TOOL USER S MANUAL 2 2 Configuring the GPIO Pins in Auto RTS CTS Flow Control Mode In Auto RTS CTS flow control mode GPIO5 RTS becomes an output pin and GPIO4 CTS becomes an input pin GPIO5 RTS can not be changed to an input and similarly GPIO4 CTS can not be changed to an output The configuration is shown below CEXAR 1 0 LAB Communications Networking Exar XR21B14111L16 Enhanced 1 Ch Full Speed USB UART sz on ajx e 3SN4S SNA XL yamoamon k siwsoids
6. block where the VID and PIDs can be entered Once the error has been fixed click Check Design again If there are no errors then a pop up window similar to the one below will appear Values accepted 02 08 PM Download Design File Click on Download Design File to view and save the generated file The file will have a xml extension This saved file can be used at a later date by loading it using the Load an Existing Design block 6 0 XR21B1411 SOFTWARE DRIVER AND OTP PROGRAMMING TOOL The XR21B1411 Software Driver and OTP Programming Tool can be downloaded from The software driver needs to be installed before the OTP Programming Tool can be used It is recommended that the configuration be carefully reviewed before programming the OTP memory Once the OTP memory has been programmed it can not be un programmed It is also recommended that samples be programmed and tested before programming in volume 13 XR21B1411 USER S MANUAL WEB CONFIGURATION TOOL USER S MANUAL REV 1 0 0 7 0 TECHNICAL SUPPORT If there are any questions about the web configuration tool configuration file or the XR21B1411 send your questions to uarttechsupport exar com NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design performance or reliability EXAR Corporation assumes no responsibility for the use of any circuits described herein conveys no license under any p
7. not be changed The Auto DTR DSR Flow Control configuration is shown below BS Home About Us News Careers Investors Contact Quality PartnerNet Welcome CEAR 1 0 LAB Communications Networking Storage Interface Exar XR21B14111L16 Enhanced 1 Ch Full Speed USB UART GPIO Pin Configuration GPIO Mode 43u OIA C Auto RTS CTS HW Flow Control XL P Auto DTR DSR Hu Flow Control asnas sna E S xu CG C Half Duplex XCVR Enable RS 495 amp Fetive High ag 8 Jeroomm eae Manage Design Configuration Files USBD GPIO1 CD Check Design O Allow configuration to be viewed by Exar CRTs iefomation avi be heated corfioeriiaiy andai only be usedto ingone tiee ks 6 GPIOXOSR Load an Existing Design Browse Load Design USBD Contact Tech Support VBUS GPIOVDTR ja fl fl f E z 9 5 k E 5 5 3 G SI 2 m HA wo x x a Py Pull Up Enabled DI Interrupt Enabled B Input Pin Editable FJ Pull Up Disabled w Interrupt Disabled DN Output Pin Locked g Pull Up Grayed w Interrupt Grayed E input Pin Locked kd Pull Down Enabled el Active Low m Default Logic Level High Editable Po Pull Down Disabled el Active High DI Default Logic Level Low Editable g Pull Down Grayed BI Output Pin Editable Ia Default Logic Level Disabled In this mode GPIO5 GPIO4 GPIO1 and GPIOO can still be configured as described in Section 2 1 Configuring the GPIO pins in G
8. tool the design configuration can be downloaded and used as an input file for Exar s OTP programming tool also available from Exar s website to program the XR21B1411 device This manual provides instruction for configuring the XR21B1411 and provides notes tips for the various settings that are available Note that once the XR21B1411 is programmed no further changes or modifications can be made to the OTP 2 0 GPIO PIN CONFIGURATIONS There are 4 modes available for the GPIO pins Details of these 4 modes can be found in the XR21B1411 datasheet on Exar s website The 4 modes that can be selected are m GPIO Mode m Auto RTS CTS HW Flow Control m Auto DTR DSR HW Flow Control m Auto Hait Duplex Transceiver Enable typically used for RS 485 2 1 Configuring the GPIO pins in GPIO Mode There are 6 GPIO pins on the XR21B1411 By default they are General Purpose I Os that can be configured either as inputs or outputs In this mode the defaults for the GPIOs are m Inputs m nternal pull up and pull down resistors disabled m Interrupts are enabled for GPIOs configured as inputs XR21B1411 USER S MANUAL KL EXAR WEB CONFIGURATION TOOL USER S MANUAL REV 1 0 0 Pa ee LEXAR ear IG LAB veer E Communications Networking Storage Interface Power Exar XR21B14111L16 Enhanced 1 Ch Full Speed USB UART F GPIO Pin Config
9. Active Low sve High BI Output Pin Editable GPIO2 OSR GPIOVOTR s10 r0ido gt k Ki Input Pin Editable DN Output Pin Locked Ki Input Pin Locked DI Default Logic Level High Editable ail Default Logic Level Low Editable EI Default Logic Level Disabled Entering a Valid Vendor ID and Product ID In this new window the USB parameters can be entered The configuration tool will have defaults of Ox0000 in the Vendor ID VID and Product ID PID field A VID or PID of 0x0000 is not an acceptable and will reported later as an error when the Check Design button is pressed if valid IDs have not been entered If using Exar s VID 0x04E2 and PID 0x1411 these values will need to be entered A unique range of PIDs can be requested from Exar by sending an e mail request to uarttechsupport exar com Interface GPIO Pin Configuration GPIO Node C Auto RTS CTS Hu Flow Control C Auto DTR DSR HW Flow Control A Halt Duplex XC VR Enable RS 485 o Active High e Fetive Low USB Configuration Vendor ID ox 0000 Product ID oxf0000 Ion be va LY Manufacturer String WS Lett Product Strin D tet 14 do be vata ONLY Serial Number Strin l AIS vet Vv Remote Wakeup E Self Powered D Enable VBUS Sense USB Max Power in m Manage Design Configuration Files Check Design 8 Allow configuration to be viewed by Exar Pts irfanation wil be vested coforta y acc will ony de usecto
10. PIO Mode on page 1 XR21B1411 USER S MANUAL KL EXAR WEB CONFIGURATION TOOL USER S MANUAL REV 1 0 0 2 4 Configuring the GPIO Pins in Auto Half Duplex Transceiver Enable Mode The Auto Half Duplex Transceiver enable mode is typically used in half duplex RS 485 applications In this mode the GPIO5 RTS pin is used to control the driver enable of an RS 485 transceiver When this mode is selected the polarity will also need to be selected as active high or active low m Active High The GPIO5 RTS pin will be low when the UART is not transmitting data and the GPIO5 RTS pin will be high when the UART is transmitting data m Active Low The GPIO5 RTS pin will be high when the UART is not transmitting data and the GPIO5 RTS pin will be low when the UART is transmitting data An example of how the Auto Half Duplex Transceiver enable mode is shown below The block next to the TX EN also shows whether the selected polarity is active high or active low Pap PO LAB C m Communications Networking Storage Interface Power Exar XR21B1411IL16 Enhanced 1 Ch Full Speed USB UART lt GPIO Pin Configuration lt i C GPIO Mode S Lo Z puto RTS CTS HW Flow Control m a az j vn m x x C Auto DTR DSR HW Flow Control d Halt Duplex XC VR Enable RS 485 P fetive High vss GO GE Manage Design Configuration Files GPIO1 CD Check Design O Allow configuration to be viewed by Exar is infomation will be ven
11. atent or other right and makes no representation that the circuits are free of patent infringement Charts and schedules contained here in are only for illustration purposes and may vary depending upon a user s specific application While the information in this publication has been carefully checked no responsibility however is assumed for inaccuracies EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly affect its safety or effectiveness Products are not authorized for use in such applications unless EXAR Corporation receives in writing assurances to its satisfaction that a the risk of injury or damage has been minimized b the user assumes all such risks c potential liability of EXAR Corporation is adequately protected under the circumstances Copyright 2010 EXAR Corporation Datasheet September 2010 Send your UART technical inquiry with technical details to hotline uarttechsupport exar com Reproduction in part or whole without the prior written consent of EXAR Corporation is prohibited 14
12. ereeensegnecsenssecenensnerseesses 10 3 5 USB MAX POWER ii ee sedis ee ENEE EEGENEN NENNEN 10 3 6 LOWPOWER PIN POOR Kee Eege ee 10 4 0 UART SETTING CONFIGURATIONS ccccccsssseeeeeeesesseeeeeesenseeneeesaesaseseeeseassasesesansasaesesonenseeeeessees 11 4 1 SELECTING THE CORE CLOCK FREQUENCY s sssscsccncenccccsecsecsusennecnsenaesenscesesensensensenezeenaceaecsasennesnseess 12 4 2 SELECTING THE UART DEFAULT SETTINGS 2 cccccceossovsesseeeneecncnceecnsccscssnsenesnsceneeeneceacsensesecnseensecnaceaessssess 12 5 0 CHECK DESIGN AND GENERATE CONFIGURATION FILE ccccccssseeeeeeeeesseseeeeessseeeeeesaneeseees 12 6 0 XR21B1411 SOFTWARE DRIVER AND OTP PROGRAMMING TOOL cccssssseeceecssnseeeeeseeeeneees 13 71 0 TECHNICAL SUPPOR T RE 14 x EXAR XR21B1411 USER S MANUAL REV 1 0 0 _ WEB CONFIGURATION TOOL USER S MANUAL 1 0 OVERVIEW The XR21B1411 Enhanced 1 Channel Full Speed USB UART has internal One Time Programmable OTP memory that can be used to customize the default settings of the XR21B1411 The web configuration tool for the XR21B1411 from Exar I O Lab is shown above and can be accessed from a link on the XR21B1411 product page on Exar s website This tool shows a visual representation of how the device will behave upon power up such as the GPIO settings UART settings and USB parameters ie Vendor ID Product ID Device Maximum Power etc Once the XR21B1411 has been configured using this
13. ingot Ze Gaza Load an Existing Design Browse Load Design Contact Tech Support XR21B1411 USER S MANUAL be j WEB CONFIGURATION TOOL USER S MANUAL REV 1 0 0 3 2 USB Manufacturer Product Serial Number Strings The default Manufacturer String is Exar and Product String is XR21B1411 if no string values have been entered There is no default value for the Serial Number String If one string is entered then all three strings need to be updated or they will not have a value when the OTP is programmed Entering a value for the Serial Number String is optional 3 3 Remote Wake up Support By default remote wake up support is enabled This can be disabled by unchecking the box Note that if the software driver does not have the remote wake up feature enabled then the XR21B1411 will not issue a remote wake up signal when a remote wake up event occurs Note that the standard CDC ACM driver does not support the Remote Wake up feature 3 4 Selecting the Power Mode By default bus powered mode is enabled The XR21B1411 can be configured for self powered mode by checking the box next to Self Powered For self power mode it is recommended that the box next to Enable VBUS Sense also be checked The VBUS Sense feature disables the internal pull up resistor on the USBD pin when there is no power on the VBUS pin This is required for USB compliance If the VBUS Sense feature is not available then an external mechanism is required
14. nput to an output will clear any PU or PD block that has been enabled for that GPIO 2 1 1 2 Enabling GPIO interrupts By default the GPIO interrupts are enabled Any GPIO that is an input will generate an interrupt when its input state changes The GPIO interrupt can be disabled by clicking on the GPIOs in the purple circle in the image above Ifa GPIO is configured as an output the interrupt will automatically be disabled for that GPIO XR21B1411 USER S MANUAL REV 1 0 0 WEB CONFIGURATION TOOL USER S MANUAL 2 1 2 Configuring GPIO outputs By clicking on the arrows highlighted with the red circle above the GPIOs will change from inputs to outputs as shown in the image below Once the GPIO is an output the block next to the output arrow will turn yellow and display 0 indicating that the default output state will be low upon power up Clicking on the this block will change it to a 1 indicating that the default output state will be high upon power up An example of this is shown below for GPIO2 re EXAR Home About Us News Careers Investors Contact Quality PartnerNet Welcome CEAR 0 LAB Communications Networking Storage Interface Power Exar XR21B14111L16 Enhanced 1 Ch Full Speed USB UART GPIO Pin Configuration GPIO Mode 43u OIA c Auto RTS CTS Hu Flow Control 0 Auto DTR DSR H Flow Control ssnas snaa E Cla Cla C Half Duplex XCYR Enable R 485 C Active High c Fetive
15. ps maximum baud rate m 24 MHz core clock frequency gt 6 Mbps maximum baud rate m 48 MHz core clock frequency gt 12 Mbps maximum baud rate For details of how much power the XR21B1411 consumes with each core clock frequency refer to the XR21B1411 datasheet on Note that the higher the core clock frequency the more power it consumes If an application is battery powered it will be beneficial to use a 6 MHz core clock frequency if baud rates above 1 5 Mbps do not need to be supported 4 2 Selecting the UART default settings Default baud rates and character formats can be entered and selected Most standard software drivers and applications will typically initialize the UART settings However this may be helpful for custom software drivers and or software applications that do not initialize configure the UART settings 5 0 CHECK DESIGN AND GENERATE CONFIGURATION FILE Once all of the desired configurations have been entered or selected click on the Check Design button This will check to see if there are any errors If there are errors then a pop up message as shown below will appear indicating the error and a button to go back to the correct page to fix it 0000 is not allowed for Vendor or Pro Back to USB Lose 12 KL EXAR XR21B1411 USER S MANUAL REV 1 0 0 WEB CONFIGURATION TOOL USER S MANUAL In this example the VID and PID were not entered Clicking on Back to USB will bring up the USB Configuration
16. ted corfoertiaiy Irait only be usedto Zeng fiue ayra USBD USB GPIO2 O0SR Contact Tech Support VBUS GPIOVOTR HamModMoT s1o roido z S1n SOid9 F9 Pull Up Enabled HI Interrupt Enabled B Input Pin Editabie F4 Pull Up Disabled ft Interrupt Disabled DN Output Pin Locked z Pull Up Grayed aa Interrupt Grayed Ki Input Pin Locked kd Pull Down Enabled D Active Low D Default Logic Level High Editable Fo Pull Down Disabled el Active High DI Default Logic Level Low Editable g Pull Down Grayed a Oulput Pin Editable oO Default Logic Level Disabled In this mode GPIO4 GPIO0 can still be configured as described in Section 2 1 Configuring the GPIO pins in GPIO Mode on page 1 REV 1 0 0 3 0 USB CONFIGURATIONS By clicking on the USB block an additional configuration window will appear on the right hand side of the screen as shown below Bi CEA Communications R 1 0 LAB Networking XR21B1411 USER S MANUAL WEB CONFIGURATION TOOL USER S MANUAL Storage Exar XR21B14111L16 Enhanced 1 Ch Full Speed USB UART VSS USBD USBD VBUS 3 1 43 OIA yamoamoI k F9 Pull Up Enabled Fq Pull Up Disabled EJ Pull Up Grayed Pro Pull Down Enabled Fo Pull Down Disabled g Pull Down Grayed 3SNaS SNBA GPIOO RIA GPIO1 CD S1y SOId9 DI Interrupt Enabled ag Interrupt Disabled EI Interrupt Grayed
17. to disable the power supply to the XR21B1411 3 5 USB Max Power By default the USB maximum power is configured as 100 mA This is the maximum for a low power device as described in the USB specifications Any board that requires more than 100 mA from VBUS will be considered a high power device The maximum allowable supply current is 500 mA for a high power device The USB max power can be changed by clicking on the arrows on either end of the scroll bar or by dragging the horizontal scroll bar 3 6 LOWPOWER Pin Polarity The default polarity of the LOWPOWER pin pin 1 is active high as shown in the drawing The polarity can be changed by clicking on the box below the USB block in the drawing The inner circle will become yellow to indicate that the LOWPOWER pin is now active low 10 EXA A XR21B1411 USER S MANUAL REV 1 0 0 WEB CONFIGURATION TOOL USER S MANUAL 4 0 UART SETTING CONFIGURATIONS Clicking on the UART block will remove the USB Configuration window and display the UART Configuration Window as shown below Home About Us New Careers Investors Contact Quality PartnerNet Welcome ear UO LAB Communications Networking Storage Interface Power Exar XR21B14111L16 Enhanced 1 Ch Full Speed USB UART GPIO Pin Configuration GPIO Mode 43u OIA 3SN3S Sg puto RTSICTS HW Flow Control Auto DTR DSR HW Flow Control Half Duplex XCYR Enable RS 485 ce Fetive High B GPIOO RI
18. uration S lt 5 GPIO Node o A R FA z 4 gt m g 1 vss 73 8 GPIOORIA USBD 14 FJ 7 GPIONCD Check Design k T Aiow configuration to be viewed by Exar rts ito chcov icttoy arc itor k improve tir ces usBD 15 2 6 GPIOZ OSR Load an Existing Design T Val Browse Load Design 2 5 Gei lessen Contact Tech Support Pele eo fro fro I 1 2 3 4 5 amp 3 2 3 5 S 8 g ae a H e D Ela Up Enabled ag RI input Pin Editabie faeu Up Disabled gl BB Output Pin Locked jeu Up Grayed D RI input Pin Locked Era Down Enabled EN DI Default Logic Level High Editable Fra Down Disabled rare High D I Default Logic Level Low Editable a Down Grayed BB Ouiput Pin Edtabie Default Logic Level Disabled 2 1 1 Configuring GPIO inputs 2 1 1 1 Enabling internal pull up or pull down resistors As an input a GPIO can have either an internal pull up or pull down resistor enabled The pull up or pull down resistor for an input can be configured by clicking on PU or PD for the desired GPIO input pins Shown in the green circles in the image above If enabled the PU or PD will turn yellow for enabled Note that the configuration tool will not allow both to be enabled at the same time The last block clicked PU or PD will determine if the GPIO has an internal pull up or pull down resistor enabled Clicking on the PU and PD blocks will not have any effects if the GPIO is an output Also changing an i

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