8-bit AVR Microcontrollers

Alternate Functions of Port E

The Port E pins with alternate functions are shown in this table:

Table 1. Port E Pins Alternate Functions
Port Pin Alternate Function
PE3

ADC7 (ADC Input Channel 7)

MOSI1 (SPI1 Master Data output)

T3 (Timer/Counter 3 External Counter Input)


PCINT27

PE2

ADC6 (ADC Input Channel 6)

ICP3 (Timer/Counter3 Input Capture Input)


SS1 (SPI1 Bus Master Slave select)


PCINT26

PE1

T4 (Timer/Counter 4 External Counter Input)


SCL1 (two-wire Serial1 Bus Clock Line)

PCINT25

PE0

ACO (AC Output Channel 0)

ICP4 (Timer/Counter4 Input Capture Input)


SDA1 (two-wire Serial1 Bus Data Input/Output Line)

PCINT24

The alternate pin configuration is as follows:

Table 2 relate the alternate functions of Port E to the overriding signals shown in Figure 1.

Table 2. Overriding Signals for Alternate Functions in PE3...PE0
Signal
Name PE3/ADC7/T3/MOSI1/PCINT27 PE2/ADC6/ICP3/SS1/PCINT26 PE1/T4/SCL1/PCINT25 PE0/ACO/ICP4/SDA1/PCINT24
PUOE SPE1 • MSTR SPE1 • MSTR TWEN aco_oe + TWEN
PUOV PORTE3 • PUD PORTE2 • PUD PORTE1 • PUD PORTE0 • PUD
DDOE SPE1 • MSTR SPE1 • MSTR TWEN aco_oe + TWEN
DDOV 0 0 0 0
PVOE SPE1 • MSTR 0 SCL_OUT aco_oe + SDA_OUT
PVOV SPI1 MSTR OUTPUT 0 TWEN acompout + TWEN
DIEOE PCINT27 • PCIE3 +ADC7D PCINT26 • PCIE3 +ADC6D PCINT25 • PCIE3 PCINT24 • PCIE3
DIEOV PCINT27 • PCIE3 PCINT26 • PCIE3 PCINT25 • PCIE3 PCINT24 • PCIE3
DI

T0 INPUT
SPI1 SLAVE INPUT
PCINT27 INPUT

PCINT26 INPUT
ICP3 INPUT
SPI SS1

T4 INPUT
PCINT25 INPUT

PCINT24 INPUT
ICP4 INPUT

AIO ADC7 INPUT ADC6 INPUT SCL1 INPUT

AC OUTPUT
SDA1 INPUT