Ports

• Port 0 - external memory access

  • low address byte/data

• Port 2 - external memory access

  • high address byte

• Port 1 - general purpose I/O

  • pins 0, 1 for timer/counter 2

• Port 3 - Special features

  • 0 - RxD: serial input
  • 1 - TxD: serial output
  • 2 - INT0: external interrupt
  • 3 - INT1: external interrupt
  • 4 - T0: timer/counter 0 external input
  • 5 - T1: timer/counter 1 external input
  • 6 - WR: external data memory write strobe
  • 7 - RD: external data memory read strobe

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