ATmega64A datasheet(83/392 Pages) ATMEL

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8160C–AVR–07/09

ATmega64A

13.3.5

Alternate Functions of Port E

The Port E pins with alternate functions are shown in Table 13-15.

Note:

1. ICP3, T3, OC3C, OC3B, OC3B, OC3A, and XCK0 not applicable in ATmega103 compatibility

mode.

• INT7/ICP3 – Port E, Bit 7

INT7, External Interrupt Source 7: The PE7 pin can serve as an External Interrupt source.

ICP3 – Input Capture Pin3: The PE7 pin can act as an Input Capture pin for Timer/Counter3.

• INT6/T3 – Port E, Bit 6

INT6, External Interrupt Source 6: The PE6 pin can serve as an External Interrupt source.

T3, Timer/Counter3 Counter Source.

• INT5/OC3C – Port E, Bit 5

INT5, External Interrupt Source 5: The PE5 pin can serve as an External Interrupt source.

OC3C, Output Compare Match C output: The PE5 pin can serve as an external output for the

Timer/Counter3 Output Compare C. The pin has to be configured as an output (DDE5 set – one)

to serve this function. The OC3C pin is also the output pin for the PWM mode timer function.

• INT4/OC3B – Port E, Bit 4

INT4, External Interrupt Source 4: The PE4 pin can serve as an External Interrupt source.

OC3B, Output Compare Match B output: The PE4 pin can serve as an external output for the

Timer/Counter3 Output Compare B. The pin has to be configured as an output (DDE4 set – one)

to serve this function. The OC3B pin is also the output pin for the PWM mode timer function.

• AIN1/OC3A – Port E, Bit 3

AIN1 – Analog Comparator Negative input. This pin is directly connected to the negative input of

the Analog Comparator.

OC3A, Output Compare Match A output: The PE3 pin can serve as an external output for the

Timer/Counter3 Output Compare A. The pin has to be configured as an output (DDE3 set – one)

to serve this function. The OC3A pin is also the output pin for the PWM mode timer function.

Table 13-15. Port E Pins Alternate Functions

Port Pin

Alternate Function

PE7

INT7/ICP3(1) (External Interrupt 7 Input or Timer/Counter3 Input Capture Pin)

PE6

INT6/ T3(1) (External Interrupt 6 Input or Timer/Counter3 Clock Input)

PE5

INT5/OC3C(1) (External Interrupt 5 Input or Output Compare and PWM Output C for

Timer/Counter3)

PE4

INT4/OC3B(1) (External Interrupt 4 Input or Output Compare and PWM Output B for

Timer/Counter3)

PE3

AIN1/OC3A (1) (Analog Comparator Negative Input or Output Compare and PWM Output A

for Timer/Counter3)

PE2

AIN0/XCK0(1) (Analog Comparator Positive Input or USART0 external clock input/output)

PE1

PDO/TXD0 (Programming Data Output or UART0 Transmit Pin)

PE0

PDI/RXD0 (Programming Data Input or UART0 Receive Pin)

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