Table of Contents
Advertisement
(3) Pull-up resistor option registers (PU0, PU1, PU3 to PU5, PU7, PU12, and PU14)
These registers specify whether the on-chip pull-up resistors of P00 to P06, P10 to P17, P30 to P33, P40 to P43,
P50 to P53, P70 to P77, P120, or P140 and P141 are to be used or not. On-chip pull-up resistors can be used in
1-bit units only for the bits set to input mode of the pins to which the use of an on-chip pull-up resistor has been
specified in PU0, PU1, PU3 to PU5, PU7, PU12, and PU14. On-chip pull-up resistors cannot be connected to
bits set to output mode and bits used as alternate-function output pins, regardless of the settings of PU0, PU1,
PU3 to PU5, PU7, PU12, and PU14.
These registers can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears these registers to 00H.
Symbol
7
6
PU0
0
PU06
7
6
PU1
PU17
PU16
7
6
PU3
0
0
7
6
PU4
0
0
7
6
PU5
0
0
7
6
PU7
PU77
PU76
7
6
PU12
0
0
7
6
PU14
0
0
PUmn
0
On-chip pull-up resistor not connected
1
On-chip pull-up resistor connected
CHAPTER 4 PORT FUNCTIONS
Figure 4-23. Format of Pull-up Resistor Option Register
5
4
3
PU05
PU04
PU03
5
4
3
PU15
PU14
PU13
5
4
3
0
0
PU33
5
4
3
0
0
PU43
5
4
3
0
0
PU53
5
4
3
PU75
PU74
PU73
5
4
3
0
0
0
5
4
3
0
0
0
Pmn pin on-chip pull-up resistor selection
(m = 0, 1, 3 to 5, 7, 12, 14; n = 0 to 7)
User's Manual U16899EJ2V0UD
2
1
0
PU02
PU01
PU00
2
1
0
PU12
PU11
PU10
2
1
0
PU32
PU31
PU30
2
1
0
PU42
PU41
PU40
2
1
0
PU52
PU51
PU50
2
1
0
PU72
PU71
PU70
2
1
0
0
0
PU120
2
1
0
0
PU141
PU140
Address
After reset
R/W
FF30H
00H
R/W
FF31H
00H
R/W
FF33H
00H
R/W
FF34H
00H
R/W
FF35H
00H
R/W
FF37H
00H
R/W
FF3CH
00H
R/W
FF3EH
00H
R/W
107
Advertisement
Table of Contents
