Port A; Overview - Renesas H8S Series Hardware Manual

9.8

Port A

9.8.1

Overview

Port A is an 8-bit I/O port. Port A pins also function as address bus outputs and interrupt input pins (IRQ4 to IRQ7). The
pin functions change according to the operating mode.
Port A has a on-chip MOS input pull-up function that can be controlled by software. Pins PA
inputs.
Figure 9-7 shows the port A pin configuration.
Port A
Pin functions in mode 6*
PA
PA
PA
PA
PA
PA
PA
PA
Note: * Modes 6 and 7 are provided in the on-chip ROM version only.
Port A pins
PA /A /IRQ7
7 23
PA /A /IRQ6
6 22
PA /A /IRQ5
5 21
PA /A /IRQ4
4 20
PA /A
3 19
PA /A
2 18
PA /A
1 17
PA /A
0 16
(input)/A (output)/IRQ7 (input)
7 23
(input)/A (output)/IRQ6 (input)
6 22
(input)/A (output)/IRQ5 (input)
5 21
(input)/A (output)/IRQ4 (input)
4 20
(input)/A (output)
3 19
(input)/A (output)
2 18
(input)/A (output)
1 17
(input)/A (output)
0 16
Figure 9-7 Port A Pin Functions
Pin functions in mode 7*
PA (I/O)/IRQ7 (input)
7
PA (I/O)/IRQ6 (input)
6
PA (I/O)/IRQ5 (input)
5
PA (I/O)/IRQ4 (input)
4
PA (I/O)
3
PA (I/O)
2
PA (I/O)
1
PA (I/O)
0
Pin functions in modes 4 and 5
PA (input)/A (output)/IRQ7 (input)
7 23
PA (input)/A (output)/IRQ6 (input)
6 22
PA (input)/A (output)/IRQ5 (input)
5 21
A (output)
20
A (output)
19
A (output)
18
A (output)
17
A (output)
16
Rev.6.00 Oct.28.2004 page 301 of 1016
to PA are schmitt-triggered
7 4
REJ09B0138-0600H