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CHAPTER 4 I/O PORTS
■ Pull-up Control Registers (PCR:PCR0 to PCR7 and PCRG)
PCR0
Address: 00000600
PCR1
Address: 00000601
PCR2
Address: 00000602
PCR3
Address: 00000603
PCR4
Address: 00000604
PCR5
Address: 00000605
PCR6
Address: 00000606
PCR7
Address: 00000607
PCRG
Address: 00000610
PCR0 to PCR7 and PCRG control the pull-up resistor for the corresponding I/O port.
PCR = 0: No pull-up resistor
PCR = 1: Pull-up resistor provided
P30 to P35, PC0 to PC7, PD0, PD1, PE0 and PE1 have no pull-up resistor.
106
7
6
5
P07
P06
P05
H
7
6
5
P17
P16
P15
H
7
6
5
P27
P26
P25
H
7
6
5
P37
P36
–
H
7
6
5
P47
P46
P45
H
7
6
5
P57
P56
P55
H
7
6
5
–
–
–
H
7
6
5
P77
P76
P75
H
7
6
5
PG5
–
–
H
4
3
2
1
P04
P03
P02
P01
4
3
2
1
P14
P13
P12
P11
4
3
2
1
P24
P23
P22
P21
4
3
2
1
–
–
–
–
4
3
2
1
P44
P43
P42
P41
4
3
2
1
P54
P53
P52
P51
4
3
2
1
P63
P62
P61
–
4
3
2
1
P74
P73
P72
P71
4
3
2
1
PG4
PG3
PG2
PG1
0
Initial value
Access
00000000
P00
B
0
Initial value
Access
00000000
P10
B
0
Initial value
Access
00000000
P20
B
0
Initial value
Access
0 0 - - - - - -
–
B
0
Initial value
Access
00000000
P40
B
0
Initial value
Access
00000000
P50
B
0
Initial value
Access
- - - - 0 0 0 0
P60
B
0
Initial value
Access
00000000
P70
B
0
Initial value
Access
--000000
PG0
B
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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