8. I/O Ports
Rev.3.00 Jul. 19, 2007 page 175 of 532
REJ09B0397-0300
Port Pull-Up Control Register 1 (PUCR1)
PUCR1 controls whether the MOS pull-up of each port 1 pin is on or off. When a PCR1 bit is
cleared to 0, setting the corresponding PUCR1 bit to 1 turns on the MOS pull-up for the
corresponding pin, while clearing the bit to 0 turns off the MOS pull-up.
Upon reset, PUCR1 is initialized to H'00.
H8/3857 Group
Bit
7 6 5 4 3 2 1 0
PUCR1
7
PUCR1
6
PUCR1
5
PUCR1
4
PUCR1
3
PUCR1
2
PUCR1
1
PUCR1
0
Initial
value 0 0 0 0 0 0 0 0
Read/Write R/W
R/W
R/W
R/W R/W R/W R/W R/W
H8/3854 Group
Bit
7 6 5 4 3 2 1 0
PUCR1
7
⎯
PUCR1
5
⎯
⎯
PUCR1
2
PUCR1
1
PUCR1
0
Initial
value 0 0 0 0 0 0 0 0
Read/Write R/W
⎯
R/W
⎯
⎯
R/W
R/W
R/W
In the H8/3854 Group, bits 6, 4, and 3 are reserved, and must always be set to 0.
Summary of Contents for F-ZTAT H8 Series
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