Table of Contents
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Type
Symbol
A/D converter,
AVSS
D/A converter
Vref
I/O ports
P17 to P10
P37 to P30
P47 to P40
P77 to P70
P97 to P90
PA3 to PA0
PB7 to PB0
PC7 to PC0
PD7 to PD0
PE7 to PE0
PF7 to PF0
PG4 to PG0
36
I/O
Name and Function
Input
Analog circuit ground and reference voltage
A/D converter and D/A converter ground and reference
voltage.
Connect to system power supply (0 V).
Input
A/D converter and D/A converter reference voltage
input pin.
When the A/D converter and D/A converter are not
used, this pin should be connected to the system
power supply (+5 V).
I/O
Port 1: An 8-bit I/O port. Input or output can be
designated for each bit by means of the port 1 data
direction register (P1DDR).
I/O
Port 3: An 8-bit I/O port. Input or output can be
designated for each bit by means of the port 3 data
direction register (P3DDR).
Input
Port 4: An 8-bit input port.
I/O
Port 7: An 8-bit I/O port. Input or output can be
designated for each bit by means of the port 7 data
direction register (P7DDR).
Input
Port 9: An 8-bit input port.
I/O
Port A: A 4-bit I/O port. Input or output can be
designated for each bit by means of the port A data
direction register (PADDR).
I/O
Port B: An 8-bit I/O port. Input or output can be
designated for each bit by means of the port B data
direction register (PBDDR).
I/O
Port C: An 8-bit I/O port. Input or output can be
designated for each bit by means of the port C data
direction register (PCDDR).
I/O
Port D: An 8-bit I/O port. Input or output can be
designated for each bit by means of the port D data
direction register (PDDDR).
I/O
Port E: An 8-bit I/O port. Input or output can be
designated for each bit by means of the port E data
direction register (PEDDR).
I/O
Port F: An 8-bit I/O port. Input or output can be
designated for each bit by means of the port F data
direction register (PFDDR).
I/O
Port G: An 5-bit I/O port. Input or output can be
designated for each bit by means of the port G data
direction register (PGDDR).
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