Datasheet

70
ATmega325/3250/645/6450
2570K–AVR–04/07
Alternate Functions of Port E The Port E pins with alternate functions are shown in Table 32.
• PCINT7 – Port E, Bit 7
PCINT7, Pin Change Interrupt Source 7: The PE7 pin can serve as an external interrupt
source.
CLKO, Divided System Clock: The divided system clock can be output on the PE7 pin.
The divided system clock will be output if the CKOUT Fuse is programmed, regardless
of the PORTE7 and DDE7 settings. It will also be output during reset.
• DO/PCINT6 – Port E, Bit 6
DO, Universal Serial Interface Data output.
PCINT6, Pin Change Interrupt Source 6: The PE6 pin can serve as an external interrupt
source.
• DI/SDA/PCINT5 – Port E, Bit 5
DI, Universal Serial Interface Data input.
SDA, Two-wire Serial Interface Data:
PCINT5, Pin Change Interrupt Source 5: The PE5 pin can serve as an external interrupt
source.
• USCK/SCL/PCINT4 – Port E, Bit 4
USCK, Universal Serial Interface Clock.
SCL, Two-wire Serial Interface Clock.
PCINT4, Pin Change Interrupt Source 4: The PE4 pin can serve as an external interrupt
source.
• AIN1/PCINT3 – Port E, Bit 3
AIN1 – Analog Comparator Negative input. This pin is directly connected to the negative
input of the Analog Comparator.
PCINT3, Pin Change Interrupt Source 3: The PE3 pin can serve as an external interrupt
source.
Table 32. Port E Pins Alternate Functions
Port Pin Alternate Function
PE7
PCINT7 (Pin Change Interrupt7)
CLKO (Divided System Clock)
PE6 DO/PCINT6 (USI Data Output or Pin Change Interrupt6)
PE5 DI/SDA/PCINT5 (USI Data Input or TWI Serial DAta or Pin Change Interrupt5)
PE4
USCK/SCL/PCINT4 (USART External Clock Input/Output or TWI Serial Clock
or Pin Change Interrupt4)
PE3 AIN1/PCINT3 (Analog Comparator Negative Input or Pin Change Interrupt3)
PE2
XCK/AIN0/ PCINT2 (USART External Clock or Analog Comparator Positive
Input or Pin Change Interrupt2)
PE1 TXD/PCINT1 (USART Transmit Pin or Pin Change Interrupt1)
PE0 RXD/PCINT0 (USART Receive Pin or Pin Change Interrupt0)