Rev. 1.0, 02/00, page 199 of 1141
Port Control Register 2 (PCR2)
0
0
1
0
W
2
0
W
3
0
4
0
W
0
W
5
0
7
0
W
W
W
W
6
PCR24
PCR23
PCR22
PCR21
PCR20
PCR27
PCR26
PCR25
Bit :
Initial value :
R/W :
Port control register 2 (PCR2) controls the I/Os of pins P27 to P20 of port 2 in a unit of bit.
When PCR2 is set to 1, the corresponding P27 to P20 pins become output pins, and when it is set
to 0, they become input pins. When the relevant pin is set to a general I/O, settings of PCR2 and
PDR2 are valid.
PCR2 is an 8-bit write-only register. When PCR2 is read, 1 is read. When reset, PCR2 is
initialized to H'00.
Bits 7 to 0
P27 to P20 Pin Switching (PCR27 to PCR20)
Bit n
PCR2n
Description
0
The P2n pin functions as an input pin
(Initial value)
1
The P2n pin functions as an output pin
(n = 7 to 0)
Port Data Register 2 (PDR2)
0
0
1
0
R/W
2
0
R/W
3
0
4
0
R/W
0
R/W
5
0
7
0
R/W
R/W
R/W
R/W
6
PDR24
PDR23
PDR22
PDR21
PDR20
PDR27
PDR26
PDR25
Bit :
Initial value :
R/W :
Port data register 2 (PDR2) stores the data for the pins P27 to P20 of port 2. When PCR2 is 1
(output), the PDR2 values are directly read if port 2 is read. Accordingly, the pin states are not
affected. When PCR2 is 0 (input), the pin states are read if port 2 is read.
PDR2 is an 8-bit read/write enable register. When reset, PDR2 is initialized to H'00.