Datasheet

62
ATmega8A [DATASHEET]
8159E–AVR–02/2013
Table 13-9 and Table 13-10 relate the alternate functions of Port D to the overriding signals shown in Figure 13-5
on page 54.
13.4 Register Description
13.4.1 PORTB – The Port B Data Register
13.4.2 DDRB – The Port B Data Direction Register
Table 13-9. Overriding Signals for Alternate Functions PD7:PD4
Signal Name PD7/AIN1 PD6/AIN0 PD5/T1 PD4/XCK/T0
PUOE 0 0 0 0
PUO 0 0 0 0
OOE 0 0 0 0
OO 0 0 0 0
PVOE 0 0 0 UMSEL
PVO 0 0 0 XCK OUTPUT
DIEOE 0 0 0 0
DIEO 0 0 0 0
DI – – T1 INPUT XCK INPUT / T0 INPUT
AIO AIN1 INPUT AIN0 INPUT – –
Table 13-10. Overriding Signals for Alternate Functions in PD3:PD0
Signal Name PD3/INT1 PD2/INT0 PD1/TXD PD0/RXD
PUOE 0 0 TXEN RXEN
PUO 0 0 0 PORTD0 • PUD
OOE 0 0 TXEN RXEN
OO 0 0 1 0
PVOE 0 0 TXEN 0
PVO 0 0 TXD 0
DIEOE INT1 ENABLE INT0 ENABLE 0 0
DIEO 1 1 0 0
DI INT1 INPUT INT0 INPUT – RXD
AIO – – – –
Bit 76543210
PORTB7 PORTB6 PORTB5 PORTB4 PORTB3 PORTB2 PORTB1 PORTB0 PORTB
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0
Bit 76543210
DDB7 DDB6 DDB5 DDB4 DDB3 DDB2 DDB1 DDB0 DDRB
Read/Write R/W R/W R/W R/W R/W R/W R/W R/W
Initial Value 0 0 0 0 0 0 0 0