upd78f0730 Renesas Electronics Corporation., upd78f0730 Datasheet - Page 78

• Manufacturer Part Number: upd78f0730
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

(3) Pull-up resistor option registers (PU0, PU1, PU3, and PU12)
78
Symbol
PU12
PU0
PU1
PU3
These registers specify whether the on-chip pull-up resistors of P00 and P01, P10 to P17, P30 to P33, or P120
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, and PU12. 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, and PU12.
These registers can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation sets these registers to 00H.
PUmn
PU17
7
0
0
0
0
1
On-chip pull-up resistor not connected
On-chip pull-up resistor connected
PU16
6
0
0
0
Figure 4-17. Format of Pull-up Resistor Option Register
PU15
5
0
0
0
PU14
Preliminary User’s Manual U19014EJ1V0UD
4
0
0
0
CHAPTER 4 PORT FUNCTIONS
PU13
PU33
Pmn pin on-chip pull-up resistor selection
3
0
0
(m = 0, 1, 3, 12; n = 0 to 7)
PU12
PU32
2
0
0
PU01
PU11
PU31
1
0
PU120
PU00
PU10
PU30
0
Address
FF3CH
FF30H
FF31H
FF33H
After reset
00H
00H
00H
00H
R/W
R/W
R/W
R/W
R/W