ATMEGA640 datasheet(92/449 Pages) ATMEL

92 / 449 page

ATmega640/1280/1281/2560/2561

2549K–AVR–01/07

Alternate Functions of Port B

The Port B pins with alternate functions are shown in Table 42.

The alternate pin configuration is as follows:

• OC0A/OC1C/PCINT7, Bit 7

OC0A, Output Compare Match A output: The PB7 pin can serve as an external output

for the Timer/Counter0 Output Compare. The pin has to be configured as an output

(DDB7 set “one”) to serve this function. The OC0A pin is also the output pin for the PWM

mode timer function.

OC1C, Output Compare Match C output: The PB7 pin can serve as an external output

for the Timer/Counter1 Output Compare C. The pin has to be configured as an output

(DDB7 set (one)) to serve this function. The OC1C pin is also the output pin for the

PWM mode timer function.

Table 41. Overriding Signals for Alternate Functions in PA3:PA0

Signal

Name

PA3/AD3

PA2/AD2

PA1/AD1

PA0/AD0

PUOE

SRE

PUOV

~(WR | ADA) •

PORTA3 • PUD

~(WR | ADA) •

PORTA2 • PUD

~(WR | ADA) •

PORTA1 • PUD

~(WR | ADA) •

PORTA0 • PUD

DDOE

SRE

DDOV

WR | ADA

PVOE

SRE

PVOV

A3 • ADA | D3

OUTPUT • WR

A2• ADA | D2

OUTPUT • WR

A1 • ADA | D1

OUTPUT • WR

A0 • ADA | D0

OUTPUT • WR

DIEOE

DIEOV

D3 INPUT

D2 INPUT

D1 INPUT

D0 INPUT

AIO

–

Table 42. Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB7

OC0A/OC1C/PCINT7 (Output Compare and PWM Output A for Timer/Counter0,

Output Compare and PWM Output C for Timer/Counter1 or Pin Change Interrupt 7)

PB6

OC1B/PCINT6 (Output Compare and PWM Output B for Timer/Counter1 or Pin

Change Interrupt 6)

PB5

OC1A/PCINT5 (Output Compare and PWM Output A for Timer/Counter1 or Pin

Change Interrupt 5)

PB4

OC2A/PCINT4 (Output Compare and PWM Output A for Timer/Counter2 or Pin

Change Interrupt 4)

PB3

MISO/PCINT3 (SPI Bus Master Input/Slave Output or Pin Change Interrupt 3)

PB2

MOSI/PCINT2 (SPI Bus Master Output/Slave Input or Pin Change Interrupt 2)

PB1

SCK/PCINT1 (SPI Bus Serial Clock or Pin Change Interrupt 1)

PB0

SS/PCINT0 (SPI Slave Select input or Pin Change Interrupt 0)

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