User manual

Basys MX3™ Board Reference Manual
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Page 44 of 56
Pin 1
Pin 12
Pin 6
8 signalsVCC GND
Figure 20.2. Pmod connectors: front view, as loaded on PCB.
Table 20.1 summarizes the content of PMODA connector.
Pmod pin
Schematic
Label
PIC32 pin
PMODA_1
JA1
RPC2/RC2
PMODA_2
JA2
RPC1/RC1
PMODA_3
JA3
RPC4/CTED7/RC4
PMODA_4
JA4
AN16/C1IND/RPG6/SCK2/PMA5/RG6
PMODA_7
JA7
RPC3/RC3
PMODA_8
JA8
AN17/C1INC/RPG7/PMA4/RG7
PMODA_9
JA9
AN18/C2IND/RPG8/PMA3/RG8
PMODA_10
JA10
AN19/C2INC/RPG9/PMA2/RG9
Table 20.1. Pmod A pinout.
Table 20.2 summarizes the content of PMODB connector.
Pmod pin
Schematic
Label
PIC32 pin
PMODB_1
JB1
RPD9/RD9
PMODB_2
JB2
RPD11/PMCS1/RD11
PMODB_3
JB3
RPD10/PMCS2/RD10
PMODB_4
JB4
RPD8/RTCC/RD8
PMODB_7
JB7
SOSCO/RPC14/T1CK/RC14
PMODB_8
JB8
RPD0/RD0
PMODB_9
JB9
AN24/RPD1/RD1
PMODB_10
JB10
SOSCI/RPC13/RC13
Table 20.2. Pmod B pinout.
The signals going to Pmod connectors are also connected to input/output pins on the PIC32 microcontroller.
Review Section 1.3 Digital Inputs and Outputs for more details regarding digital I/Os.
Instead of using the Pmod pins as regular digital input/output pins, the pins can be mapped to several peripherals,
as explained in Section 1.4 Remappable pins. For example, the SPI2 interface is implemented over the PMODA
pins, as explained in Section 11.2 SPI2.
In the above tables, the highlighted pins are 5V tolerant pins. It is safe to apply 5V logic signals directly to these
pins without risk of damage to the microcontroller. All other pins support 3.3V only.
Each pin has a 200-ohm series resistor and an ESD protection diode. The series resistor provides short circuit
protection to prevent damaging the I/O block in the microcontroller if the pin is inadvertently shorted to VDD or
GND, or two outputs are shorted together. The ESD protection diode protects the I/O block from damage due to
electro-static discharge.