ATMEGA88 datasheet(72/349 Pages) ATMEL

72 / 349 page

ATmega48/88/168

2545D–AVR–07/04

Notes:

1. INTRC means that one of the internal RC Oscillators are selected (by the CKSEL

fuses), EXTCK means that external clock is selected (by the CKSEL fuses).

Table 34. Overriding Signals for Alternate Functions in PB7..PB4

Signal

Name

PB7/XTAL2/

TOSC2/PCINT7(1)

PB6/XTAL1/

TOSC1/PCINT6(1)

PB5/SCK/

PCINT5

PB4/MISO/

PCINT4

PUOE

INTRC • EXTCK+

AS2

INTRC + AS2

SPE • MSTR

PUOV

PORTB5 • PUD

PORTB4 • PUD

DDOE

INTRC • EXTCK+

AS2

INTRC + AS2

SPE • MSTR

DDOV

PVOE

SPE • MSTR

PVOV

SCK OUTPUT

SPI SLAVE

OUTPUT

DIEOE

INTRC • EXTCK +

AS2 + PCINT7 •

PCIE0

INTRC + AS2 +

PCINT6 • PCIE0

PCINT5 • PCIE0

PCINT4 • PCIE0

DIEOV

(INTRC + EXTCK)

• AS2

INTRC • AS2

PCINT7 INPUT

PCINT6 INPUT

PCINT5 INPUT

SCK INPUT

PCINT4 INPUT

SPI MSTR INPUT

AIO

Oscillator Output

Oscillator/Clock

Input

––

Table 35. Overriding Signals for Alternate Functions in PB3..PB0

Signal

Name

PB3/MOSI/

OC2/PCINT3

PB2/SS/

OC1B/PCINT2

PB1/OC1A/

PCINT1

PB0/ICP1/

PCINT0

PUOE

SPE • MSTR

PUOV

PORTB3 • PUD

PORTB2 • PUD

DDOE

SPE • MSTR

DDOV

PVOE

SPE • MSTR +

OC2A ENABLE

OC1B ENABLE

OC1A ENABLE

PVOV

SPI MSTR

OUTPUT + OC2A

OC1B

OC1A

DIEOE

PCINT3 • PCIE0

PCINT2 • PCIE0

PCINT1 • PCIE0

PCINT0 • PCIE0

DIEOV

111

PCINT3 INPUT

SPI SLAVE

INPUT

PCINT2 INPUT

SPI SS

PCINT1 INPUT

PCINT0 INPUT

ICP1 INPUT

AIO

–––

–

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