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5.10
Port A
5.10.1
Overview
Port A is an 8-bit I/O port. Port A pins also function as address bus outputs. The pin functions
change according to the operating mode. Address output or port output can be selected with bits
A23E to A16E in PFCR1.
Port A has a built-in MOS input pull-up function that can be controlled by software.
Figure 5.9 shows the port A pin configuration.
PA7 / A23
PA6 / A22
PA5 / A21
PA4 / A20
PA3 / A19
PA2 / A18
PA1 / A17
PA0 / A16
Port A
Port A pins
PA7 (I/O) / A23 (output)
PA6 (I/O) / A22 (output)
PA5 (I/O) / A21 (output)
A20 (output)
A19 (output)
A18 (output)
A17 (output)
A16 (output)
Pin functions in modes 1, 2, 5, and 6
PA7 (I/O) / A23 (output)
PA6 (I/O) / A22 (output)
PA5 (I/O) / A21 (output)
PA4 (I/O) / A20 (output)
PA3 (I/O) / A19 (output)
PA2 (I/O) / A18 (output)
PA1 (I/O) / A17 (output)
PA0 (I/O) / A16 (output)
Pin functions in modes 4 and 7
Figure 5.9 Port A Pin Functions
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