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ManualsBrandsMICROCHIP TECHNOLOGY ManualsMicrocontrollers, Microprocessors & QuartzesEmbedded microcontroller TQFP 64 (14x14) 8-Bit 20 MHz I/O number 54
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ATmega169A/PA/329A/PA/649A/P/3290A/PA/6490A/P [DATASHEET]
8284E–AVR–02/2013
14.3.5 Alternate functions of Port E
The Port E pins with alternate functions are shown in Table 14-15.
• 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 out-
put 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.
• XCK/AIN0/PCINT2 – Port E, Bit 2
XCK, USART0 External Clock. The Data Direction Register (DDE2) controls whether the clock is output (DDE2
set) or input (DDE2 cleared). The XCK pin is active only when the USART0 operates in synchronous mode.
Table 14-15. 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 (USART0 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 (USART0 External Clock or Analog Comparator Positive Input or Pin Change Interrupt2)
PE1 TXD/PCINT1 (USART0 Transmit Pin or Pin Change Interrupt1)
PE0 RXD/PCINT0 (USART0 Receive Pin or Pin Change Interrupt0)