upd78f0124hgba1-8et-a Renesas Electronics Corporation., upd78f0124hgba1-8et-a Datasheet - Page 93

• Manufacturer Part Number: upd78f0124hgba1-8et-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(3) Pull-up resistor option registers (PU0, PU1, PU3, PU7, PU12, and PU14)
Symbol
PU12
PU14
PU0
PU1
PU3
PU7
These registers specify whether the on-chip pull-up resistors of P00 to P03, P10 to P17, P30 to P33, P70 to P77,
P120, or P140 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, 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, 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.
PUmn
PU17
PU77
7
0
7
7
0
7
7
0
7
0
0
1
On-chip pull-up resistor not connected
On-chip pull-up resistor connected
PU16
PU76
6
0
6
6
0
6
6
0
6
0
Figure 4-20. Format of Pull-up Resistor Option Register
PU15
PU75
5
0
5
5
0
5
5
0
5
0
PU14
PU74
4
0
4
4
0
4
4
0
4
0
CHAPTER 4 PORT FUNCTIONS
User’s Manual U16962EJ3V0UD
PU03
PU13
PU33
PU73
Pmn pin on-chip pull-up resistor selection
3
3
3
3
3
0
3
0
(m = 0, 1, 3, 7, 12, 14; n = 0 to 7)
PU02
PU12
PU32
PU72
2
2
2
2
2
0
2
0
PU01
PU11
PU31
PU71
1
1
1
1
1
0
1
0
PU120
PU140
PU00
PU10
PU30
PU70
0
0
0
0
0
0
Address
FF3CH
FF3EH
FF30H
FF31H
FF33H
FF37H
After reset
00H
00H
00H
00H
00H
00H
R/W
R/W
R/W
R/W
R/W
R/W
R/W
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