SH7751 Datasheet, PDF (859/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

18. I/O Ports
18.2.3 Port Control Register B (PCTRB)
Port control register B (PCTRB) is a 32-bit readable/writable register that controls the input/output
direction and pull-up for each bit in the 16-bit port B (port 31 pin to port 16 pin). As the initial
value of port data register B (PDTRB) is undefined, each bit in the 16-bit port B should be set to
output with PCTRB after writing a value to the PDTRB register.
PCTRB is initialized to H'00000000 by a power-on reset. It is not initialized by a manual reset or
in standby mode, and retains its contents.
Bit: 31
30
29
28
27
26
25
24
PB31PUP PB31IO PB30PUP PB30IO PB29PUP PB29IO PB28PUP PB28IO
Initial value:
0
0
0
0
0
0
0
0
R/W: R
R
R
R
R
R
R
R
Bit: 23
22
21
20
19
18
17
16
PB27PUP PB27IO PB26PUP PB26IO PB25PUP PB25IO PB24PUP PB24IO
Initial value:
0
0
0
0
0
0
0
0
R/W: R
R
R
R
R
R
R
R
Bit: 15
14
13
12
11
10
9
8
PB23PUP PB23IO PB22PUP PB22IO PB21PUP PB21IO PB20PUP PB20IO
Initial value:
0
0
0
0
0
0
0
0
R/W: R
R
R
R
R
R
R
R
Bit:
7
6
5
4
3
2
1
0
PB19PUP PB19IO PB18PUP PB18IO PB17PUP PB17IO PB16PUP PB16IO
Initial value:
0
0
0
0
0
0
0
0
R/W: R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
Rev.4.00 Oct. 10, 2008 Page 761 of 1122
REJ09B0370-0400