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8.2.2
Register Configuration and Description
Table 8.2 shows the port 1 register configuration.
Table 8.2
Port 1 Registers
Name
Port data register 1
Port control register 1
Port pull-up control register 1
Port mode register 1
Port Data Register 1 (PDR1)
PDR1 is an 8-bit register that stores data for pins P1
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.
Upon reset, PDR1 is initialized to H'00 (H8/3857 Group) or H'58 (H8/3854 Group).
H8/3857 Group
Bit
P1
Initial value
Read/Write
R/W
H8/3854 Group
Bit
P1
Initial value
Read/Write
R/W
In the H8/3854 Group, bits 6, 4, and 3 are reserved, and must always be set to 1.
Abbr.
PDR1
PCR1
PUCR1
PMR1
7
6
5
P1
P1
7
6
0
0
0
R/W
R/W
7
6
5
⎯
P1
7
0
1
0
⎯
R/W
R/W
Initial Value
R/W
H'00
W
H'00
R/W
H'00
R/W
H'00
through P1
7
0
4
3
P1
P1
5
4
3
0
0
R/W
R/W
4
3
⎯
⎯
5
1
1
⎯
⎯
Rev.3.00 Jul. 19, 2007 page 173 of 532
Address
H'FFD4
H'FFE4
H'FFE0
H'FFC8
. If port 1 is read while PCR1 bits
2
1
P1
P1
2
1
0
0
R/W
R/W
2
1
P1
P1
2
1
0
0
R/W
R/W
REJ09B0397-0300
8. I/O Ports
0
P1
0
0
R/W
0
P1
0
0
R/W
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