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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:
Initial value:
R/W:
Bit:
Initial value:
R/W:
Rev. 4.0, 04/00, page 650 of 850
31
30
0
0
R/W
R/W
23
22
0
0
R/W
R/W
15
14
PB7PUP
PB7IO
0
0
R/W
R/W
7
6
PB3PUP
PB3IO
0
0
R/W
R/W
29
28
0
0
R/W
R/W
21
20
0
0
R/W
R/W
13
12
PB6PUP
PB6IO
0
0
R/W
R/W
5
4
PB2PUP
PB2IO
0
0
R/W
R/W
27
26
0
0
R/W
R/W
19
18
PB9PUP
PB9IO
0
0
R/W
R/W
11
10
PB5PUP
PB5IO
0
0
R/W
R/W
3
2
PB1PUP
PB1IO
0
0
R/W
R/W
25
24
0
0
R/W
R/W
17
16
PB8PUP
PB8IO
0
0
R/W
R/W
9
8
PB4PUP
PB4IO
0
0
R/W
R/W
1
0
PB0PUP
PB0IO
0
0
R/W
R/W
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