HD64F38024HV Datasheet, PDF (257/684 Pages) Renesas Technology Corp – Hardware Manual Renesas 8-Bit Single-Chip Microcomputer H8 Family/H8/300L Super Low Power Series

8.10 Port A
8.10.1 Overview
Port A is a 4-bit I/O port, configured as shown in figure 8.9.
Section 8 I/O Ports
Port A
PA₃/COM₄
PA₂/COM₃
PA₁/COM₂
PA₀/COM₁
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
Port data register A
Port control register A
Abbr.
PDRA
PCRA
R/W
Initial Value Address
R/W
H'F0
H'FFDD
W
H'F0
H'FFED
Port Data Register A (PDRA)
Bit
7
6
5
4
3
2
1
0
⎯
⎯
⎯
⎯
PA ₃
PA ₂
PA ₁
PA ₀
Initial value
1
1
1
1
0
0
0
0
Read/Write
⎯
⎯
⎯
⎯
R/W R/W R/W R/W
PDRA is an 8-bit register that stores data for port A pins PA₃ to PA₀. 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.
Rev. 8.00 Mar. 09, 2010 Page 235 of 658
REJ09B0042-0800