Rev. 1.0, 09/02, page 126 of 568
9.1.2
Port 1 Data Register (P1DR)
P1DR is an 8-bit readable/writable register that stores output data for port 1 pins.
Bit
Bit Name
Initial Value
R/W
Description
7 P17DR 0
R/W
6 P16DR 0
R/W
5 P15DR 0
R/W
4 P14DR 0
R/W
3 P13DR 0
R/W
2 P12DR 0
R/W
1 P11DR 0
R/W
0 P10DR 0
R/W
Output data for a pin is stored when the pin is
specified as a general purpose I/O port.
9.1.3
Port 1 Register (PORT1)
PORT1 is an 8-bit read-only register that shows the pin states.
PORT1 cannot be modified.
Bit
Bit Name
Initial Value
R/W
Description
7 P17
Undefined
*
R
6 P16
Undefined
*
R
5 P15
Undefined
*
R
4 P14
Undefined
*
R
3 P13
Undefined
*
R
2 P12
Undefined
*
R
1 P11
Undefined
*
R
0 P10
Undefined
*
R
If a port 1 read is performed while P1DDR bits are
set to 1, the P1DR values are read. If a port 1 read is
performed while P1DDR bits are cleared to 0, the pin
states are read.
Note:
*
Determined by the states of pins P17 to P10.
Содержание H8S/2627
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