Register Descriptions; Port Control Register A (Pctra) - Hitachi SH7750 Hardware Manual

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 (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 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:
PB15PUP PB15IO PB14PUP PB14IO PB13PUP PB13IO PB12PUP PB12IO
Initial value:
R/W:
Bit:
PB11PUP PB11IO PB10PUP PB10IO
Initial value:
R/W:
Bit:
PB7PUP
Initial value:
R/W:
Bit:
PB3PUP
Initial value:
R/W:
Rev. 6.0, 07/02, page 742 of 986
31 30 29
0 0
R/W R/W R/W
23 22 21
0 0
R/W R/W R/W
15 14 13
PB7IO PB6PUP
0 0
R/W R/W R/W
7 6
PB3IO PB2PUP
0 0
R/W R/W R/W
28 27
0 0 0
R/W R/W
20 19
PB9PUP
0 0 0
R/W R/W
12 11
PB6IO PB5PUP
0 0 0
R/W R/W
5 4 3
PB2IO PB1PUP
0 0 0
R/W R/W
26 25
0 0
R/W R/W R/W
18 17
PB9IO PB8PUP PB8IO
0 0
R/W R/W R/W
10 9
PB5IO PB4PUP PB4IO
0 0
R/W R/W R/W
2 1
PB1IO PB0PUP PB0IO
0 0
R/W R/W R/W
24
0
16
0
8
0
0
0