UPD78F0411GA-GAM-AX Datasheet, PDF (100/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 4 PORT FUNCTIONS
(3) Pull-up resistor option registers (PU1, PU3, PU4, PU10 to PU12, PU14, PU15)
These registers specify whether the on-chip pull-up resistors of P12, P13, P31 to P34, P40, P100, P101, P112,
P113, P120, P140 to P143, or P150 to P153 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 PU1, PU3, PU4, PU10 to PU12, PU14, and PU15. 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 PU1, PU3,
PU4, PU10 to PU12, PU14, and PU15.
These registers can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears these registers to 00H.
Symbol
7
PU1
0
Figure 4-18. Format of Pull-up Resistor Option Register
6
5
4
3
2
1
0
Address After reset R/W
0
0
0
PU13 PU12
0
0
FF31H
00H
R/W
PU3
0
0
0
PU34 PU33 PU32 PU31
0
FF33H
00H
R/W
PU4
0
0
0
0
0
0
0
PU40 FF34H
00H
R/W
PU10
0
0
0
0
0
0
PU101 PU100 FF3AH
00H
R/W
PU11
0
0
0
0
PU113 PU112
0
0
FF3BH
00H
R/W
PU12
0
0
0
0
0
0
0
PU120 FF3CH
00H
R/W
PU14
0
0
0
0
PU143 PU142 PU141 PU140 FF3EH
00H
R/W
PU15
0
0
0
0
PU153 PU152 PU151 PU150 FF3FH
00H
R/W
PUmn
0
1
Pmn pin on-chip pull-up resistor selection
(m = 1, 3, 4, 10 to 12, 14, 15; n = 0 to 4)
On-chip pull-up resistor not connected
On-chip pull-up resistor connected
98
User’s Manual U18698EJ1V0UD