Datasheet

74
8023F–AVR–07/09
ATmega325P/3250P
13.3.2 Alternate Functions of Port D
The Port D pins with alternate functions are shown in Table 13-6.
The alternate pin configuration is as follows:
•INT0 – Port D, Bit 1
INT0, External Interrupt Source 0. The PD1 pin can serve as an external interrupt source to the
MCU.
• ICP1 – Port D, Bit 0
ICP1 – Input Capture pin1: The PD0 pin can act as an Input Capture pin for Timer/Counter1.
Table 13-7 relates the alternate functions of Port D to the overriding signals shown in Figure 13-
5 on page 69.
Table 13-6. Port D Pins Alternate Functions (SEG refers to 100-pin/64-pin pinout)
Port Pin Alternate Function
PD7
PD6
PD5
PD4
PD3
PD2
PD1 INT0
(External Interrupt0 Input)
PD0 ICP1 (Timer/Counter1 Input Capture pin)
Table 13-7. Overriding Signals for Alternate Functions in PD3:PD0
Signal Name PD3 PD2 PD1/INT0 PD0/ICP1
PUOE 0 0 0) 0
PUOV0000
DDOE 0 0 0 0
DDOV 0 0 0 0
PVOE0000
PVOV0000
PTOE––––
DIEOE 0 0 INT0 ENABLE 0
DIEOV 0 0 INT0 ENABLE 0
DI – – INT0 INPUT ICP1 INPUT
AIO – – – –