Specifications

Serial port 0
Four IO pins can optionally function as UART0. IO16 becomes RXD0 and IO17 becomes TXD0. If
hardware flow control is required, IO20 becomes CTS0 and IO21 becomes RTS0.
Serial port 1
Four IO pins can optionally function as UART1. IO10 becomes RXD1 and IO11 becomes TXD1. If
hardware flow control is required, IO12 becomes CTS1 and IO23 becomes RTS1.
PWM Output Pins
On the ATmega128RFA1 Wireless Module, you can use the following IOs for pulse width modulation
PWM:
IO4: Maps to OC2
IO5: Maps to OC1A
IO6: Maps to OC1B
IO7: Maps to OC1C and OC0A
IO19: Maps to OC3A
IO20: Maps to OC3B
IO21: Maps to OC3C
IO37: Maps to OC0B
SPI
Three IO pins can optionally function as an SPI bus. IO29 becomes SCLK, IO30 becomes MOSI, and
IO28 becomes MISO.
I
2
C
Two IO pins can optionally function as an I
2
C bus. IO24 becomes SCL, and IO25 becomes SDA.
SNAP Reference Manual Document Number 600-0007K Page 155 of 202