SH7751 Datasheet, PDF (857/1224 Pages) Renesas Technology Corp – 32-Bit RISC Microcomputer

18. I/O Ports
18.2 Register Descriptions
18.2.1 Port Control Register A (PCTRA)
Port control register A (PCTRA) is a 32-bit readable/writable register that controls the
input/output direction and pull-up for each bit in the 16-bit port A (port 15 pin to port 0 pin). As
the initial value of port data register A (PDTRA) is undefined, all the bits in the 16-bit port A
should be set to output with PCTRA after writing a value to the PDTRA register.
PCTRA 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
PB15PUP PB15IO PB14PUP PB14IO PB13PUP PB13IO PB12PUP PB12IO
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
Bit: 23
22
21
PB11PUP PB11IO PB10PUP
Initial value:
0
0
0
R/W: R/W
R/W
R/W
20
PB10IO
0
R/W
19
PB9PUP
0
R/W
18
PB9IO
0
R/W
17
PB8PUP
0
R/W
16
PB8IO
0
R/W
Bit: 15
PB7PUP
Initial value:
0
R/W: R/W
14
PB7IO
0
R/W
13
PB6PUP
0
R/W
12
PB6IO
0
R/W
11
PB5PUP
0
R/W
10
PB5IO
0
R/W
9
PB4PUP
0
R/W
8
PB4IO
0
R/W
Bit:
7
PB3PUP
Initial value:
0
R/W: R/W
6
PB3IO
0
R/W
5
PB2PUP
0
R/W
4
PB2IO
0
R/W
3
PB1PUP
0
R/W
2
PB1IO
0
R/W
1
PB0PUP
0
R/W
0
PB0IO
0
R/W
Rev.4.00 Oct. 10, 2008 Page 759 of 1122
REJ09B0370-0400