Datasheet

90
2549O–AVR–05/12
ATmega640/1280/1281/2560/2561
13.3.7 Alternate Functions of Port G
The Port G alternate pin configuration is as follows:
Table 13-19. Overriding Signals for Alternate Functions in PF7:PF4
Signal
Name PF7/ADC7/TDI PF6/ADC6/TDO PF5/ADC5/TMS PF4/ADC4/TCK
PUOE JTAGEN JTAGEN JTAGEN JTAGEN
PUOV 1 0 1 1
DDOE JTAGEN JTAGEN JTAGEN JTAGEN
DDOV 0
SHIFT_IR +
SHIFT_DR
00
PVOE 0 JTAGEN 00
PVOV 0 TDO 0 0
DIEOE JTAGEN JTAGEN JTAGEN JTAGEN
DIEOV 0 0 0 0
DI – – – –
AIO TDI/ADC7 INPUT ADC6 INPUT TMS/ADC5 INPUT TCK/ADC4 INPUT
Table 13-20. Overriding Signals for Alternate Functions in PF3:PF0
Signal Name PF3/ADC3 PF2/ADC2 PF1/ADC1 PF0/ADC0
PUOE0000
PUOV0000
DDOE0000
DDOV0000
PVOE0000
PVOV0000
DIEOE0000
DIEOV0000
DI––––
AIO ADC3 INPUT ADC2 INPUT ADC1 INPUT ADC0 INPUT
Table 13-21. Port G Pins Alternate Functions
Port Pin Alternate Function
PG5 OC0B (Output Compare and PWM Output B for Timer/Counter0)
PG4 TOSC1 (RTC Oscillator Timer/Counter2)
PG3 TOSC2 (RTC Oscillator Timer/Counter2)
PG2 ALE (Address Latch Enable to external memory)
PG1 RD
(Read strobe to external memory)
PG0 WR
(Write strobe to external memory)