ATMega chip full datasheet - UCSD Department of Physics

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ATmega48A/PA/88A/PA/168A/PA/328/P• INT0/PCINT18 – Port D, Bit 2INT0, External Interrupt source 0: The PD2 pin can serve as an external interrupt source.PCINT18: Pin Change Interrupt source 18. The PD2 pin can serve as an external interruptsource.• TXD/PCINT17 – Port D, Bit 1TXD, Transmit Data (Data output pin for the USART). When the USART Transmitter is enabled,this pin is configured as an output regardless of the value of DDD1.PCINT17: Pin Change Interrupt source 17. The PD1 pin can serve as an external interruptsource.• RXD/PCINT16 – Port D, Bit 0RXD, Receive Data (Data input pin for the USART). When the USART Receiver is enabled thispin is configured as an input regardless of the value of DDD0. When the USART forces this pinto be an input, the pull-up can still be controlled by the PORTD0 bit.PCINT16: Pin Change Interrupt source 16. The PD0 pin can serve as an external interruptsource.Table 14-10 and Table 14-11 relate the alternate functions of Port D to the overriding signalsshown in Figure 14-5 on page 82.Table 14-10.Overriding Signals for Alternate Functions PD7...PD4SignalNamePD7/AIN1/PCINT23PD6/AIN0/OC0A/PCINT22PD5/T1/OC0B/PCINT21PD4/XCK/T0/PCINT20PUOE 0 0 0 0PUO 0 0 0 0DDOE 0 0 0 0DDOV 0 0 0 0PVOE 0 OC0A ENABLE OC0B ENABLE UMSELPVOV 0 OC0A OC0B XCK OUTPUTDIEOE PCINT23 • PCIE2 PCINT22 • PCIE2 PCINT21 • PCIE2 PCINT20 • PCIE2DIEOV 1 1 1 1DI PCINT23 INPUT PCINT22 INPUTPCINT21 INPUTT1 INPUTPCINT20 INPUTXCK INPUTT0 INPUTAIO AIN1 INPUT AIN0 INPUT – –8271D–AVR–05/1192
ATmega48A/PA/88A/PA/168A/PA/328/PTable 14-11.SignalNameOverriding Signals for Alternate Functions in PD3...PD0PD3/OC2B/INT1/PCINT19PD2/INT0/PCINT18PD1/TXD/PCINT17PD0/RXD/PCINT16PUOE 0 0 TXEN RXENPUO 0 0 0 PORTD0 • PUDDDOE 0 0 TXEN RXENDDOV 0 0 1 0PVOE OC2B ENABLE 0 TXEN 0PVOV OC2B 0 TXD 0DIEOEINT1 ENABLE +PCINT19 • PCIE2INT0 ENABLE +PCINT18 • PCIE1PCINT17 • PCIE2DIEOV 1 1 1 1DIPCINT19 INPUTINT1 INPUTPCINT18 INPUTINT0 INPUTPCINT17 INPUTAIO – – – –PCINT16 • PCIE2PCINT16 INPUTRXD8271D–AVR–05/1193
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Features• High Performance, Low P
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Atmel Corporation2325 Orchard Parkw
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ATMega chip full datasheet - UCSD Department of Physics

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