ATmega128 datasheet(74/386 Pages) ATMEL

74 / 386 page

2467S–AVR–07/09

ATmega128

Alternate Functions of

Port B

The Port B pins with alternate functions are shown in Table 30.

Note:

1. OC1C not applicable in ATmega103 compatibility mode.

The alternate pin configuration is as follows:

• OC2/OC1C, Bit 7

OC2, Output Compare Match output: The PB7 pin can serve as an external output for the

Timer/Counter2 Output Compare. The pin has to be configured as an output (DDB7 set “one”) to

serve this function. The OC2 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 29. 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 30. Port B Pins Alternate Functions

Port Pin

Alternate Functions

PB7

OC2/OC1C(1) (Output Compare and PWM Output for Timer/Counter2 or Output

Compare and PWM Output C for Timer/Counter1)

PB6

OC1B (Output Compare and PWM Output B for Timer/Counter1)

PB5

OC1A (Output Compare and PWM Output A for Timer/Counter1)

PB4

OC0 (Output Compare and PWM Output for Timer/Counter0)

PB3

MISO (SPI Bus Master Input/Slave Output)

PB2

MOSI (SPI Bus Master Output/Slave Input)

PB1

SCK (SPI Bus Serial Clock)

PB0

SS (SPI Slave Select input)

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