Datasheet

Section 10 I/O Ports
REJ09B0465-0300 Rev. 3.00 Page 315 of 982
Sep 17, 2010
H8S/20103, H8S/20203, H8S/20223, H8S/20115, H8S/20215, H8S/20235 Group
10.8.2 Port Control Register A (PCRA)
b7
PCRA7
0
b6
PCRA6
0
b5
PCRA5
0
b4
PCRA4
0
b3
⎯
0
b2
⎯
0
b1
⎯
0
b0
⎯
0
H'FFFFF9
Bit:
Address:
Value after reset:
Bit Symbol Bit Name Description R/W
7 PCRA7 Port A7 control R/W
6 PCRA6 Port A6 control R/W
5 PCRA5 Port A5 control R/W
4 PCRA4 Port A4 control
0: When the corresponding pin is designated as a
general I/O port, the pin functions as an input
port.
1: When the corresponding pin is designated as a
general I/O port, the pin functions as an output
port.
PCRA is a register that selects inputs/outputs in bit
units for pins to be used as general I/O ports of port
A.
R/W
3 to 0 ⎯ Reserved These bits are read as 0. The write value should be
0.
⎯
• PCRA7 bit to PCRA4 bit (port A7 to A4 control)
When the corresponding pin is designated in PMRA as a general I/O pin, setting a PCRA bit to
1 makes the corresponding pin an output port, while clearing the bit to 0 makes the pin an
input port.