Datasheet

81
2549O–AVR–05/12
ATmega640/1280/1281/2560/2561
Table 13-7 and Table 13-8 relate the alternate functions of Port B to the overriding signals
shown in Figure 13-5 on page 76. SPI MSTR INPUT and SPI SLAVE OUTPUT constitute the
MISO signal, while MOSI is divided into SPI MSTR OUTPUT and SPI SLAVE INPUT.
PCINT0, Pin Change Interrupt source 0: The PB0 pin can serve as an external interrupt source.
Table 13-7. Overriding Signals for Alternate Functions in PB7:PB4
Signal
Name PB7/OC0A/OC1C PB6/OC1B PB5/OC1A PB4/OC2A
PUOE 0 0 0 0
PUOV 0 0 0 0
DDOE 0 0 0 0
DDOV 0 0 0 0
PVOE OC0/OC1C ENABLE OC1B ENABLE OC1A ENABLE OC2A ENABLE
PVOV OC0/OC1C OC1B OC1A OC2A
DIEOE PCINT7 • PCIE0 PCINT6 • PCIE0 PCINT5 • PCIE0 PCINT4 • PCIE0
DIEOV 1 1 1 1
DI PCINT7 INPUT PCINT6 INPUT PCINT5 INPUT PCINT4 INPUT
AIO – – – –
Table 13-8. Overriding Signals for Alternate Functions in PB3:PB0
Signal
Name PB3/MISO PB2/MOSI PB1/SCK PB0/SS
PUOE SPE • MSTR SPE • MSTR SPE • MSTR SPE • MSTR
PUOV PORTB3 • PUD PORTB2 • PUD PORTB1 • PUD PORTB0 • PUD
DDOE SPE • MSTR SPE • MSTR SPE • MSTR SPE • MSTR
DDOV 0 0 0 0
PVOE SPE • MSTR
SPE • MSTR SPE • MSTR 0
PVOV SPI SLAVE OUTPUT SPI MSTR OUTPUT SCK OUTPUT 0
DIEOE PCINT3 • PCIE0 PCINT2 • PCIE0 PCINT1 • PCIE0 PCINT0 • PCIE0
DIEOV 1 1 1 1
DI
SPI MSTR INPUT
PCINT3 INPUT
SPI SLAVE INPUT
PCINT2 INPUT
SCK INPUT
PCINT1 INPUT
SPI SS
PCINT0 INPUT
AIO – – – –