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chipkit_uno32:chipkit_uno32_rev_c [2015/05/15 23:24] – [chipKIT Uno32 Hardware Description] Joshua Woldstadchipkit_uno32:chipkit_uno32_rev_c [2022/10/04 11:38] (current) – external edit 127.0.0.1
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 ====== Peripheral I/O Functions  ====== ====== Peripheral I/O Functions  ======
  
-The PIC32 microcontroller on the Uno32 board +The PIC32 microcontroller on the Uno32 board provides a number of peripheral functions. The following peripherals are provided:  
-provides a number of peripheral functions. The + 
-following peripherals are provided: +====UART port 1:==== Asynchronous serial port. Pin 0 
 +(RX), Pin 1 (TX). These pins are connected to 
 +I/O connector J6 and are also connected to the 
 +FT232R USB serial converter. It is possible to 
 +use these pins to connect to an external serial device when not using the USB serial 
 +interface. This uses UART1 (U1RX, U1TX) on 
 +the PIC32 microcontroller.  
 + 
 +====UART port 2: ==== 
 +Asynchronous serial port. Pin 39 
 +(RX), Pin 40 (TX). This uses UART2 (U2RX, 
 +U2TX) on the PIC32 microcontroller.   
 + 
 +==== SPI: ==== 
 + 
 +Synchronous serial port. Pin 10 (SS), Pin 
 +11 (MOSI), Pin 12 (MISO), Pin 13 (SCK). This 
 +uses SPI2 (SS2, SDI2, SDO2, SCK2) on the 
 +PIC32 microcontroller These signals also 
 +appear on connector J8.  
 + 
 +Jumpers JP5 and JP7 are used to select 
 +whether the Uno32 operates as a Master 
 +(transmit on MOSI, receive on MISO) or a 
 +Slave (transmit on MISO, receive on MOSI) 
 +device. The shorting blocks on JP5 and JP7 
 +are normally placed in the Master position for 
 +the Uno32 to function as an SPI master.  
 + 
 +Jumper JP4 is used to select PWM output or 
 +the SPI SS function on Pin 10. The shorting 
 +block on JP4 should be in the RD4 position to 
 +select PWM output. It should be in the RG9 
 +position to select the SPI SS function.. JP4 will 
 +normally be in the RD4 position. In general, the 
 +only time it needs to be in the RG9 position is 
 +when the Uno32 board is being used as an SPI 
 +slave device.  
 + 
 +==== I²C: ==== 
 + 
 +Synchronous serial interface. The PIC32 
 +microcontroller shares analog pins A4 and A5 
 +with the two I²C signals SDA and SCL. 
 +Jumpers JP6 and JP8 are used to select 
 +whether the analog pin functions or the I²C pin functions are being used. The shorting blocks 
 +are placed in the A4/A5 position to select the 
 +analog input function or general digital I/O. 
 +They are placed in the RG3/RG2 position to 
 +use the pins for I²C operation. This uses I²C1 
 +(SDA1, SCL1) on the PIC32 microcontroller.  
 + 
 +**Note:** 
 + 
 +The I²C bus uses open collector drivers 
 +to allow multiple devices to drive the bus 
 +signals. This means that pull-up resistors must 
 +be provided to supply the logic high state for 
 +the signals. These pull-up resistors are not on 
 +the Uno32 board and must be provided  
 +externally. The required resistance of the pullup 
 +resistor to use depends on the total number 
 +of devices on the bus, the length of wire, and 
 +the clock speed being used. It essentially 
 +depends on distributed capacitance on the 
 +bus. The higher the distributed capacitance 
 +and the faster the clock speed, the smaller the 
 +resistance should be. Values typically used are 
 +in the range of 2K to 10K ohms.  
 + 
 +==== PWM: ==== 
 + 
 +Pulse width modulated output. Pins 3 
 +(OC1), 5 (OC2), 6 (OC3), 9 (OC4), and 10 
 +(OC5).  
 + 
 + 
 +==== External Interrupts: ==== 
 + 
 +Pin 38 (INT0), Pin 2 
 +(INT1), Pin 7 (INT2), Pin 8 (INT3), Pin 35 
 +(INT4)  
 + 
 +==== User LEDs: ==== 
 + 
 +Pin 13 (LD4), Pin 43 (LD5). Pin 13 
 +is shared between a connector pin and the 
 +LED. Pin 43 only goes to the LED and not any 
 +connector pin. Driving the pin high turns the 
 +LED on, driving it low turns it off.  
 + 
 +====A/D Converter Reference:==== 
 + 
 +Labeled A, the leftmost 
 +outer pin on connector J5. This is used to 
 +provide an external voltage reference to 
 +determine the input voltage range of the 
 +analog pins. The maximum voltage that can be 
 +applied to this pin is 3.3V. This pin can also be 
 +used as digital pin 42.  
 + 
 +==== RTCC: ==== 
 + 
 +Real Time Clock Calendar. The PIC32 
 +microcontroller contains an RTCC circuit that 
 +can be used to maintain time and date 
 +information. The operation of the RTCC 
 +requires a 32.768Khz frequency source. 
 +Crystal X2 (not loaded), just above and to the 
 +right of the PIC32 microcontroller IC, is 
 +provided for you to solder a 32Khz watch 
 +crystal. The Citizen CFS206-32.768KDZF-UB 
 +crystal can be used in this location. 
 + 
 +==== RESET: ==== 
 + 
 +The PIC32 microcontroller is reset by 
 +bringing its MCLR pin low. The MCLR pin is 
 +connected to the P32_RST net on the circuit 
 +board.  
 + 
 +As described earlier, reset of the PIC32 
 +microcontroller can be initiated by the USB serial converter. The USB serial converter 
 +brings the DTR pin low to reset the 
 +microcontroller. Jumper JP1 can be used to 
 +enable/disable the ability for the USB serial 
 +converter to initiate a reset.  
 + 
 +The P32_RST net is connected to pin 1 of 
 +connector J2. This allows circuitry on a shield 
 +to reset the microcontroller, or to ensure that 
 +the circuitry on the shield is reset at the same 
 +time as the microcontroller. 
 +Connector J8 provides access to the SPI bus. 
 +Pin 5 provides access to the SPI Slave Select 
 +signal (SS). 
 + 
 +On Arduino boards, the corresponding 
 +connector is also used as an in-system 
 +programming connector as well as providing 
 +access to some of the SPI signals. On Arduino 
 +boards, pin 5 of this connector is connected to 
 +the reset net. 
 + 
 +Some Arduino shields, notably, the Ethernet 
 +shield, connect pin 5 to the reset net on pin 1 
 +of connector J2. This causes the processor to 
 +be reset each time an attempt is made to 
 +access the SPI port. Jumper JP9 can be used 
 +to break the connection between J8 pin 5 and 
 +reset when using Arduino shields that make 
 +this connection. JP9 has a cut-able trace on 
 +the bottom of the board that can be cut to 
 +break the connection between SPI SS and 
 +reset. JP9 is not loaded at the factory. To 
 +restore the connection, solder a two pin header 
 +at the JP9 position and install a shorting block. 
 + 
 +A reset button is at the upper left corner of the 
 +board. Pressing this button resets the PIC32 
 +microcontroller.  
 + 
 + 
 +---- 
 + 
 +====== Microchip Development Tool Compatibility ====== 
 + 
 +In addition to being used with the MPIDE, the 
 +Uno32 board can be used as a more traditional 
 +microcontroller development board using 
 +Microchip Development Tools. 
 + 
 +Unloaded connector JP3 on the left side of the 
 +board is used to connect to a Microchip 
 +development tool, such as the PICkit3™. The 
 +holes for JP3 are staggered so that a standard 
 +100-mil spaced 6-pin header can be press fit to 
 +the board without the need to solder it in place. 
 +Any Microchip development tool that supports 
 +the PIC32 microcontroller family, and can be 
 +connected via the same 6-pin interface as the 
 +PICkit3, can be used. 
 + 
 +Typically, a right-angle male connector is used 
 +in JP3 so that a PICkit3 can be attached 
 +coplanar with the Uno32 board. The connector 
 +can be loaded from the top, or it can be loaded 
 +from the bottom. In either case the PICkit3 will 
 +be upright (button and LEDs visible). 
 + 
 +If JP3 is loaded from the top, the PICkit3 will 
 +interfere with the USB connector and the 
 +external power connector. A short six-wire 
 +cable can be used between the PICkit3 and 
 +the Uno32. If JP3 is loaded from the bottom, 
 +the PICkit3 won’t interfere with the USB and 
 +external power connectors. 
 + 
 +The Digilent PICkit3 Programming Cable Kit 
 +includes all necessary connectors and a cable 
 +for connecting a PICkit3 to the Uno32. 
 +The Microchip MPLAB® IDE or the MPLAB® X 
 +IDE can be used to program and debug code 
 +running on the Uno32 board. These programs 
 +can be downloaded from the Microchip web 
 +site. 
 + 
 +Using the Microchip development tools to 
 +program the Uno32 board will cause the boot 
 +loader to be erased. To use the board with the 
 +MPIDE again, it is necessary to program the 
 +boot loader back onto the board. The boot 
 +loader source code and compiled image can 
 +be found in the MPIDE software download.  
 + 
 +---- 
 + 
 +======Pinout Tables====== 
 + 
 +The following tables give the relationship 
 +between the chipKIT digital pin numbers, the 
 +connector pin numbers and the microcontroller 
 +pin numbers. 
 + 
 +In the following tables, columns labeled 
 +chipKIT pin # refer to the digital pin number. 
 +This is the value that is passed to the 
 +pinMode(), digitalRead(), digitalWrite() and 
 +other functions to refer to the pin. 
 + 
 +For most pins, this pin number will agree with 
 +the pin number labeled on the board. For the 
 +pins whose function can be switched using 
 +jumpers, the pin number labeled on the board 
 +is correct when the jumper is in the ‘normal’ 
 +position.  
 + 
 +For example: The normal position for JP4 is 
 +the RD4 position. The digital pin number for 
 +the microcontroller signal RD4 is 10. With JP4 
 +in the RD4 position, digital pin 10 is connected 
 +to the pin labeled 10 on the board. The 
 +alternate position for JP4 is the RG9 position. 
 +The digital pin number for the microcontroller 
 +signal RG9 is 44. With JP4 in the RG9 
 +position, digital pin 44 is connected to the pin 
 +labeled 10 on the board, and digital pin 10 is 
 +not connected. 
 + 
 +The pin labeled 10 on the board is connected 
 +to connector J5 pin 5. This is shown as J5-05 
 +in the following tables. In the ‘Pinout Table by 
 +Shield Connector Pin’ table below, J5-05 is 
 +shown has being either chipKIT pin # 10 or 44. 
 +J5-04 is connected to chipKIT pin # 10 when 
 +JP4 is in the RD4 position and is connected to 
 +chipKIT pin # 44 when in the RG9 position. 
 + 
 + 
 +---- 
 + 
 +====== Pinout Table by Logical Pin Number ====== 
 +| chipKIT Pin #  | Connector Pin #  | PIC32 Pin #  | PIC32 Signal                          | Notes                           | 
 +| 0              | J6-01            | 34           | U1RX/SDI1/RF2                         |                                 | 
 +| 1              | J6-03            | 33           | U1TX/SDO1/RF3                         |                                 | 
 +| 2              | J6-05            | 42           | IC1/RTCC/INT1/RD8                     |                                 | 
 +| 3              | J6-07            | 46           | OC1/RD0                               |                                 | 
 +| 4              | J6-09            | 59           | RF1                                   |                                 | 
 +| 5              | J6-11            | 49           | OC2/RD1                               |                                 | 
 +| 6              | J6-13            | 50           | OC3/RD2                               |                                 | 
 +| 7              | J6-15            | 43           | IC2/U1CTS/INT2/RD9                    |                                 | 
 +| 8              | J5-01            | 44           | IC3/PMCS2/PMA15/INT3/RD10             |                                 | 
 +| 9              | J5-03            | 51           | OC4/RD3                               |                                 | 
 +| 10             | J5-05            | 52           | PMWR/OC5/IC5/CN13/RD4                 | selected by JP4, also on J8-6   | 
 +| 11             | J5-07            | 6            | SDO2/PMA3/CN10/RG8                    | selected by JP5, also on J8-1   | 
 +| 12             | J5-09            | 5            | SDI2/PMA5/CN8/RG7                     | selected by JP7, also on J8-4   | 
 +| 13             | J5-11            | 4            | SCK2/PMA5/CN8/RG6                     | also on J8-3, User LED LD4r     | 
 +| 14/A0          | J7-01            | 14           | C2IN-/AN2/SS1/CN4/RB2                 |                                 | 
 +| 15/A1          | J7-03            | 12           | C1IN-/AN4/CN6/RB4                     |                                 | 
 +| 16/A2          | J7-05            | 21           | U2CTS/C1OUT/AN8/RB8                   |                                 | 
 +| 17/A3          | J7-07            | 23           | TMS/CVREFOUT/PMA13/AN10/RB10          |                                 | 
 +| 18/A4          | J7-09            | 27           | TCK/PMA11/AN12/RB12                   | selected by JP6                 | 
 +| 19/A5          | J7-11            | 29           | PMALH/PMA1/U2RTS/AN14/RB14            | selected by JP8                 | 
 +| 20/A6          | J7-02            | 13           | C2IN+/AN3/CN5/RB3                     |                                 | 
 +| 21/A7          | J7-04            | 11           | C1IN+/AN5/CN7/RB5                     |                                 | 
 +| 22/A8          | J7-06            | 22           | PMA7/C2OUT/AN9/RB9                    |                                 | 
 +| 23/A9          | J7-08            | 24           | TDO/PMA12/AN11/RB11                   |                                 | 
 +| 24/A10         | J7-10            | 28           | TDI/PMA10/AN13/RB13                   |                                 | 
 +| 25/A11         | J7-12            | 30           | PMALL/PMA0/AN15/OCFB/CN12/RB15        |                                 | 
 +| 26             | J6-02            | 60           | PMD0/RE0                              |                                 | 
 +| 27             | J6-04            | 61           | PMD1/RE1                              |                                 | 
 +| 28             | J6-06            | 62           | PMD2/RE2                              |                                 | 
 +| 29             | J6-08            | 63           | PMD3/RE3                              |                                 | 
 +| 30             | J6-10            | 64           | PMD4/RE4                              |                                 | 
 +| 31             | J6-12            | 1            | PMD5/RE5                              |                                 | 
 +| 32             | J6-14            | 2            | PMD6/RE6                              |                                 | 
 +| 33             | J6-16            | 3            | PMD7/RE7                              |                                 | 
 +| 34             | J5-02            | 53           | PMRD/CN14/RD5                         |                                 | 
 +| 35             | J5-04            | 45           | IC4/PMCS1/PMA14/INT4/RD11             |                                 | 
 +| 36             | J5-06            | 54           | CN15/RD6                              |                                 | 
 +| 37             | J5-08            | 55           | CN16/RD7                              |                                 | 
 +| 38             | J5-10            | 35           | U1RTS/BCLK1/SCK1/INT0/RF6             |                                 | 
 +| 39             | J5-12            | 31           | PMA9/U2RX/SDA2/CN17/RF4               |                                 | 
 +| 40             | J5-14            | 32           | PMA8/U2TX/SCL2/CN18/RF5               |                                 | 
 +| 41             | J5-16            | 15           | PGC1/AN1/VREF-/CVREF-/CN3/RB1         |                                 | 
 +| 42             | J5-15            | 16           | PGED1/PMA6/AN0/VREF+/CVREF+/CN2/RB0   |                                 | 
 +| 43             | N/A              | 58           | RF0                                   | User LED LD5                    | 
 +| 44             | J5-05            | 8            | PMA2/SS2/CN11/RG9                     | selected by JP4, also on J8-6   | 
 +| 45             | J7-09            | 36           | SDA1/RG3                              | selected by JP6                 | 
 +| 46             | J7-11            | 37           | SCL1/RG2                              | selected by JP8                 |