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ATmega128
? ICP1 – Port D, Bit 4
ICP1 – Input Capture Pin1: The PD4 pin can act as an Input Capture Pin for Timer/Counter1.
? INT3/TXD1 – Port D, Bit 3
INT3, External Interrupt source 3: The PD3 pin can serve as an external interrupt source to the
MCU.
TXD1, Transmit Data (Data output pin for the USART1). W hen the USART1 Transmitter is
enabled, this pin is configured as an output regardless of the value of DDD3.
? INT2/RXD1 – Port D, Bit 2
INT2, External Interrupt source 2. The PD2 pin can serve as an External Interrupt source to the
MCU.
RXD1, Receive Data (Data input pin for the USART1). W hen the USART1 receiver is enabled
this pin is configured as an input regardless of the value of DDD2. W hen the USART forces this
pin to be an input, the pull-up can still be controlled by the PORTD2 bit.
? INT1/SDA – Port D, Bit 1
INT1, External Interrupt source 1. The PD1 pin can serve as an external interrupt source to the
MCU.
SDA, Two-wire Serial Interface Data: W hen the T W EN bit in T W CR is set (one) to enable the
Two-wire Serial Interface, pin PD1 is disconnected from the port and becomes the Serial Data
I/O pin for the Two-wire Serial Interface. In this mode, there is a spike filter on the pin to sup-
press spikes shorter than 50 ns on the input signal, and the pin is driven by an open drain driver
with slew-rate limitation.
? INT0/SCL – Port D, Bit 0
INT0, External Interrupt source 0. The PD0 pin can serve as an external interrupt source to the
MCU.
SCL, Two-wire Serial Interface Clock: W hen the T W EN bit in T W CR is set (one) to enable the
Two-wire Serial Interface, pin PD0 is disconnected from the port and becomes the Serial Clock
I/O pin for the Two-wire Serial Interface. In this mode, there is a spike filter on the pin to sup-
press spikes shorter than 50ns on the input signal, and the pin is driven by an open drain driver
with slew-rate limitation.
Table 37 and Table 38 relates the alternate functions of Port D to the overriding signals shown in
Figure 33 on page 70 .
78
2467X–AVR–06/11
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