upd78f0103hmca1-5a4-a Renesas Electronics Corporation., upd78f0103hmca1-5a4-a Datasheet - Page 80

• Manufacturer Part Number: upd78f0103hmca1-5a4-a
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

(3) Pull-up resistor option registers (PU0, PU1, PU3, and PU12)
80
Symbol
PU12
PU0
PU1
PU3
These registers specify whether the on-chip pull-up resistors of P00 to P03, P10 to P17, P30 to P33, or P120 is to
be used or not. An 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. On-chip pull-up resistor cannot be
connected for bits set to output mode and bits used as alternate-function output pins, regardless of the settings of
PU0, PU1, PU3 and PU12.
These registers can be set by a 1-bit or 8-bit memory manipulation instruction.
RESET input clears these registers to 00H.
PUmn
PU17
7
0
7
7
0
7
0
0
1
On-chip pull-up resistor not connected
On-chip pull-up resistor connected
PU16
6
0
6
6
0
6
0
Figure 4-16. Format of Pull-up Resistor Option Register
PU15
5
0
5
5
0
5
0
PU14
CHAPTER 4 PORT FUNCTIONS
4
0
4
4
0
4
0
User’s Manual U16846EJ3V0UD
Pmn pin on-chip pull-up resistor selection
PU03
PU13
PU33
3
3
3
3
0
(m = 0, 1, 3, 12; n = 0 to 7)
PU02
PU12
PU32
2
2
2
2
0
PU01
PU11
PU31
1
1
1
1
0
PU120
PU00
PU10
PU30
0
0
0
0
Address After reset
FF3CH
FF30H
FF31H
FF33H
00H
00H
00H
00H
R/W
R/W
R/W
R/W
R/W