Datasheet

Section 8 I/O Ports
Rev. 6.00 Aug 04, 2006 page 249 of 680
REJ09B0145-0600
2. Port Control Register A (PCRA)
Bit
Initial value
Read/Write
7
—
1
—
6
—
1
—
5
—
1
—
4
—
1
—
3
PCRA
0
R/W
0
PCRA
0
R/W
2
PCRA
0
R/W
1
PCRA
0
R/W
3210
PCRA controls whether each of port A pins PA
3
to PA
0
functions as an input pin or output pin.
Setting a PCRA bit to 1 makes the corresponding pin an output pin, while clearing the bit to 0
makes the pin an input pin. PCRA and PDRA settings are valid when the corresponding pins are
designated for general-purpose input/output by LPCR.
Upon reset, PCRA is initialized to H'F0.
PCRA is a write-only register, which always reads all 1s.