Digilent Basys MX3 Reference Manual page 44

Basys MX3™ Board Reference Manual
Table 20.1 summarizes the content of PMODA connector.
Pmod pin
PMODA_1
PMODA_2
PMODA_3
PMODA_4
PMODA_7
PMODA_8
PMODA_9
PMODA_10
Table 20.2 summarizes the content of PMODB connector.
Pmod pin
PMODB_1
PMODB_2
PMODB_3
PMODB_4
PMODB_7
PMODB_8
PMODB_9
PMODB_10
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
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.
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.
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VCC GND 8 signals
Pin 6
Pin 12
Figure 20.2. Pmod connectors: front view, as loaded on PCB.
Schematic
PIC32 pin
Label
JA1 RPC2/RC2
JA2 RPC1/RC1
JA3 RPC4/CTED7/RC4
JA4 AN16/C1IND/RPG6/SCK2/PMA5/RG6
JA7 RPC3/RC3
JA8 AN17/C1INC/RPG7/PMA4/RG7
JA9 AN18/C2IND/RPG8/PMA3/RG8
JA10 AN19/C2INC/RPG9/PMA2/RG9
Table 20.1. Pmod A pinout.
Schematic
PIC32 pin
Label
JB1 RPD9/RD9
JB2 RPD11/PMCS1/RD11
JB3 RPD10/PMCS2/RD10
JB4 RPD8/RTCC/RD8
JB7 SOSCO/RPC14/T1CK/RC14
JB8 RPD0/RD0
JB9 AN24/RPD1/RD1
JB10 SOSCI/RPC13/RC13
Table 20.2. Pmod B pinout.
for more details regarding digital I/Os.
For example, the SPI2 interface is implemented over the PMODA
Pin 1
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