ATMEGA8_08 Datasheet, PDF (60/308 Pages) ATMEL Corporation – 8-bit with 8K Bytes In-System Programmable Flash

Table 23. Overriding Signals for Alternate Functions in PB7..PB4
Signal
Name
PUOE
PUO
DDOE
DDOV
PVOE
PVOV
DIEOE
DIEOV
DI
AIO
PB7/XTAL2/
TOSC2⁽¹⁾⁽²⁾
EXT • (INTRC +
AS2)
0
EXT • (INTRC +
AS2)
0
0
0
EXT • (INTRC +
AS2)
0
–
Oscillator Output
PB6/XTAL1/
TOSC1⁽¹⁾
INTRC + AS2
0
INTRC + AS2
0
0
0
INTRC + AS2
0
–
Oscillator/Clock
Input
PB5/SCK
SPE • MSTR
PB4/MISO
SPE • MSTR
PORTB5 • PUD PORTB4 • PUD
SPE • MSTR
SPE • MSTR
0
SPE • MSTR
SCK OUTPUT
0
0
SPE • MSTR
SPI SLAVE OUTPUT
0
0
SCK INPUT
–
0
SPI MSTR INPUT
–
Notes: 1. INTRC means that the internal RC Oscillator is selected (by the CKSEL Fuse).
2. EXT means that the external RC Oscillator or an external clock is selected (by the CKSEL
Fuse).
Table 24. Overriding Signals for Alternate Functions in PB3..PB0
Signal
Name PB3/MOSI/OC2
PB2/SS/OC1B PB1/OC1A
PUOE SPE • MSTR
SPE • MSTR
0
PUO PORTB3 • PUD
PORTB2 • PUD 0
DDOE SPE • MSTR
SPE • MSTR
0
DDOV 0
0
0
PVOE SPE • MSTR +
OC2 ENABLE
OC1B ENABLE OC1A ENABLE
PVOV SPI MSTR OUTPUT + OC2 OC1B
OC1A
DIEOE 0
0
0
DIEOV 0
0
0
DI
SPI SLAVE INPUT
SPI SS
–
AIO
–
–
–
PB0/ICP1
0
0
0
0
0
0
0
0
ICP1 INPUT
–
60 ATmega8(L)
2486T–AVR–05/08