Rainbow Electronics ATmega128RFA1 - Manual (Page 198)

198
8266A-MCU Wireless-12/09
ATmega128RFA1
Port
Pin Alternate Function
PE0 RXD0/PCINT8 (USART0 Receive Pin or Pin Change Interrupt8)
• INT7/ICP3/CLKO – Port E, Bit 7
INT7, External Interrupt source 7: The PE7 pin can serve as an external interrupt
source.
ICP3, Input Capture Pin 3: The PE7 pin can act as an input capture pin for
Timer/Counter3.
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.
• INT6/T3 – Port E, Bit 6
INT6, External Interrupt source 6: The PE6 pin can serve as an external interrupt
source.
T3, this is the 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.
• AIN0/XCK0 – Port E, Bit 2
AIN0 – Analog Comparator Positive input. This pin is directly connected to the positive
input of the Analog Comparator.
XCK0, this is the USART0 External clock. The Data Direction Register (DDE2) controls
whether the clock is output (DDE2 set) or input (DDE2 cleared). The XCK0 pin is active
only when the USART0 operates in Synchronous mode.
• TXD0 – Port E, Bit 1
TXD0, this is the USART0 Transmit pin.
• RXD0/PCINT8 – Port E, Bit 0