Renesas H8 Series Hardware Manual

Section 8 I/O Ports
Rev. 7.00 Mar 10, 2005 page 233 of 652
REJ09B0042-0700
8.10 Port A
8.10.1 Overview
Port A is a 4-bit I/O port, configured as shown in figure 8.9.
PA
3
/COM
4
PA
2
/COM
3
PA
1
/COM
2
PA
0
/COM
1
Port A
Figure 8.9 Port A Pin Configuration
8.10.2 Register Configuration and Description
Table 8.26 shows the port A register configuration.
Table 8.26 Port A Registers
Name Abbr. R/W Initial Value Address
Port data register A PDRA R/W H'F0 H'FFDD
Port control register A PCRA W H'F0 H'FFED
Port Data Register A (PDRA)
Bit
Initial value
Read/Write
7

1

6

1

5

1

4

1

3
PA
0
R/W
0
PA
0
R/W
2
PA
0
R/W
1
PA
0
R/W
3210
PDRA is an 8-bit register that stores data for port A pins PA
3
to PA
0
. If port A is read while
PCRA bits are set to 1, the values stored in PDRA are read, regardless of the actual pin states. If
port A is read while PCRA bits are cleared to 0, the pin states are read.
Upon reset, PDRA is initialized to H'F0.

Renesas H8 Series Specifications

General

Brand	Renesas
Model	H8 Series
Category	Computer Hardware
Language	English