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7.3.2 Register Descriptions
Table 7-3 summarizes the registers of port 2.
Table 7-3 Port 2 Registers
*
Address
Name
H'FFC1
Port 2 data direction
register
H'FFC3
Port 2 data register
H'FFD8
Port 2 input pull-up
control register
Note: * Lower 16 bits of the address.
Port 2 Data Direction Register (P2DDR): P2DDR is an 8-bit write-only register that can select
input or output for each pin in port 2.
Bit
P2 DDR
Initial value
Modes
1 and 3
Read/Write
Initial value
Modes
5 to 7
Read/Write
P2DDR is initialized to H'00 by a reset and in hardware standby mode. In software standby mode
it retains its previous setting. If a P2DDR bit is set to 1, the corresponding pin maintains its output
state in software standby mode.
140
Abbreviation
P2DDR
P2DR
P2PCR
7
6
P2 DDR
P2 DDR
7
6
1
1
—
—
0
0
W
W
R/W
W
R/W
R/W
5
4
P2 DDR
P2 DDR
5
4
1
1
—
—
0
0
W
W
Port 2 data direction 7 to 0
These bits select input or
output for port 2 pins
Initial Value
Modes 1 and 3
H'FF
H'00
H'00
3
2
P2 DDR
P2 DDR
3
2
1
1
—
—
0
0
W
W
Modes 5 to 7
H'00
H'00
H'00
1
0
P2 DDR
1
0
1
1
—
—
0
0
W
W
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