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Table 2. 80-Pin Package Pin Description
Port Pin
Signal
Name
Pin No. In/Out
Function
Basic Alternate
AD0 36 I/O
External Bus
Multiplexed Address/Data bus A1/D1
AD1 37 I/O Multiplexed Address/Data bus A0/D0
AD2 38 I/O Multiplexed Address/Data bus A2/D2
AD3 39 I/O Multiplexed Address/Data bus A3/D3
AD4 41 I/O Multiplexed Address/Data bus A4/D4
AD5 43 I/O Multiplexed Address/Data bus A5/D5
AD6 45 I/O Multiplexed Address/Data bus A6/D6
AD7 47 I/O Multiplexed Address/Data bus A7/D7
P1.0 T2 52 I/O General I/O port pin Timer 2 Count input
P1.1 TX2 54 I/O General I/O port pin Timer 2 Trigger input
P1.2 RxD1 56 I/O General I/O port pin 2nd UART Receive
P1.3 TxD1 58 I/O General I/O port pin 2nd UART Transmit
P1.4 ADC0 59 I/O General I/O port pin ADC Channel 0 input
P1.5 ADC1 60 I/O General I/O port pin ADC Channel 1 input
P1.6 ADC2 61 I/O General I/O port pin ADC Channel 2 input
P1.7 ADC3 64 I/O General I/O port pin ADC Channel 3 input
A8 51 O External Bus, Address A8
A9 53 O External Bus, Address A9
A10 55 O External Bus, Address A10
A11 57 O External Bus, Address A11
P3.0 RxD0 75 I/O General I/O port pin UART Receive
P3.1 TxD0 77 I/O General I/O port pin UART Transmit
P3.2 EXINT0 79 I/O General I/O port pin
Interrupt 0 input / Timer 0 gate
control
P3.3 EXINT1 2 I/O General I/O port pin
Interrupt 1 input / Timer 1 gate
control
P3.4 T0 40 I/O General I/O port pin Counter 0 input
P3.5 T1 42 I/O General I/O port pin Counter 1 input
P3.6 SDA1 44 I/O General I/O port pin
I
2
C Bus serial data I/O
P3.7 SCL1 46 I/O General I/O port pin
I
2
C Bus clock I/O
P4.0 33 I/O General I/O port pin
P4.1 31 I/O General I/O port pin
P4.2 30 I/O General I/O port pin
P4.3 PWM0 27 I/O General I/O port pin
8-bit Pulse Width Modulation
output 0