HD6473887 Datasheet, PDF (189/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

2. Port control register A (PCRA)
Bit
7
6
5
—
—
—
Initial value
1
1
1
Read/Write
—
—
—
4
3
2
1
0
—
PCRA ₃ PCRA ₂ PCRA ₁ PCRA ₀
1
0
0
0
0
—
R/W
R/W
R/W
R/W
PCRA controls whether each of port A pins PA₃ to PA₀ 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.
172