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Port Data Register 1 (PDR1)
Bit
7
P1
Initial value
0
Read/Write
R/W
PDR1 is an 8-bit register that stores data for port 1 pins P1
while PCR1 bits are set to 1, the values stored in PDR1 are read, regardless of the actual pin states.
If port 1 is read while PCR1 bits are cleared to 0, the pin states are read.
Note: * Pin 1
and the associated function are not implemented on the H8/38124 Group.
6
Port Control Register 1 (PCR1)
Bit
7
PCR1
Initial value
0
Read/Write
W
PCR1 is an 8-bit register for controlling whether each of the port 1 pins P1
functions as an input pin or output pin. Setting a PCR1 bit to 1 makes the corresponding pin an
output pin, while clearing the bit to 0 makes the pin an input pin. The settings in PCR1 and in
PDR1 are valid only when the corresponding pin is designated in PMR1 as a general I/O pin.
PCR1 is a write-only register, which is always read as all 1s.
Note: * Pin 1
and the associated function are not implemented on the H8/38124 Group.
6
Rev. 6.00, 08/04, page 190 of 628
6
5
P1
—
*
7
6
0
—
R/W
—
6
5
PCR1
—
*
7
6
0
—
W
W
4
3
P1
P1
4
3
0
0
R/W
R/W
, P1
*, P1
7
6
4
4
3
PCR1
PCR1
4
3
0
0
W
W
2
1
—
—
—
—
—
—
, and P1
. If port 1 is read
3
2
1
—
—
—
—
W
W
, P1
*, P1
, and P1
7
6
4
0
—
—
—
0
—
—
W
3
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