Renesas H8/38342, Hardware Manual

Page: 273 / 721

Section 8 I/O Ports
Rev. 6.00 Aug 04, 2006 page 235 of 680
REJ09B0145-0600
1. Port Data Register 6 (PDR6)
Bit
Initial value
Read/Write
7
P6
0
R/W
6
P6
0
R/W
5
P6
0
R/W
4
P6
0
R/W
3
P6
0
R/W
0
P6
0
R/W
2
P6
0
R/W
1
P6
0
R/W
2 1 0 5 4 7 6 3
PDR6 is an 8-bit register that stores data for port 6 pins P6
7
to P6
0
.
If port 6 is read while PCR6 bits are set to 1, the values stored in PDR6 are read, regardless of the
actual pin states. If port 6 is read while PCR6 bits are cleared to 0, the pin states are read.
Upon reset, PDR6 is initialized to H'00.
2. Port Control Register 6 (PCR6)
Bit
Initial value
Read/Write
7
PCR6
7
0
W
6
PCR6
6
0
W
5
PCR6
5
0
W
4
PCR6
4
0
W
3
PCR6
3
0
W
0
PCR6
0
0
W
2
PCR6
2
0
W
1
PCR6
1
0
W
PCR6 is an 8-bit register for controlling whether each of the port 6 pins P6
7
to P6
0
functions as an
input pin or output pin.
Setting a PCR6 bit to 1 makes the corresponding pin (P6
7
to P6
0
) an output pin, while clearing the
bit to 0 makes the pin an input pin. PCR6 and PDR6 settings are valid when the corresponding
pins are designated for general-purpose input/output by bits SGS3 to SGS0 in LPCR.
Upon reset, PCR6 is initialized to H'00.
PCR6 is a write-only register, which always reads all 1s.