Overview - Hitachi H8S/2678 Series Reference Manual

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.
Port A
246
Port A pins
PA7 / A23
PA6 / A22
PA5 / A21
PA4 / A20
PA3 / A19
PA2 / A18
PA1 / A17
PA0 / A16
Figure 5.9 Port A Pin Functions
Pin functions in modes 1, 2, 5, and 6
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 4 and 7
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)