Alternate Functions of Port E The Port E pins with alternate functions are shown in Table 41.
Table 41. Port E Pins Alternate Functions
Port Pin Alternate Function
PE7
PE6
INT7/ICP3 (External Interrupt 7 Input or Timer/Counter3 Input Capture Trigger)
INT6/ T3 (External Interrupt 6 Input or Timer/Counter3 Clock Input)
INT5/OC3C (External Interrupt 5 Input or Output Compare and PWM Output C for
Timer/Counter3)
PE5
PE4
PE3
PE2
INT4/OC3B (External Interrupt4 Input or Output Compare and PWM Output B for
Timer/Counter3)
AIN1/OC3A (Analog Comparator Negative Input or Output Compare and PWM
Output A for Timer/Counter3)
AIN0/XCK0 (Analog Comparator Positive Input or USART0 external clock
input/output)
PE1
PE0
PDO/TXD0 (Programming Data Output or UART0 Transmit Pin)
PDI/RXD0 (Programming Data Input or UART0 Receive Pin)
The alternate pin configuration is as follows:
• PCINT7/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.
78
AT90CAN128
4250E–CAN–12/04
ATMEL [ ATMEL ]
