UPD78F9500MA-CAC-A Datasheet, PDF (72/342 Pages) Renesas Technology Corp – 8-Bit Single-Chip Microcontrollers

CHAPTER 4 PORT FUNCTIONS
(4) Pull-up resistor option registers (PU2 to PU4)
These registers are used to specify whether an on-chip pull-up resistor is connected to P20 to P23, P32, P34,
P40 and P43. By setting PU2 to PU4, an on-chip pull-up resistor can be connected to the port pin
corresponding to the bit of PU2 to PU4.
PU2 to PU4 are set by using a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation set these registers to 00H.
Figure 4-15. Format of Pull-up Resistor Option Register
Address: FF32H, After reset: 00H R/W
Symbol
7
6
5
PU2
0
0
0
4
3
2
1
0
0
PU23
PU22
PU21
PU20
Address: FF33H, After reset: 00H R/W
Symbol
7
6
5
4
3
2
1
0
PU3
0
0
0
PU34^Note
0
PU32
0
0
Address: FF34H, After reset: 00H R/W
Symbol
7
6
5
PU4
0
0
0
4
3
2
0
PU43
0
1
0
0
PU40
PUmn
0
1
Selection of connection of on-chip pull-up resistor of Pmn (m = 2 to 4; n = 0 to 4)
Does not connect on-chip pull-up resistor
Connects on-chip pull-up resistor
<R> Note μPD78F950x only
70
User’s Manual U18172EJ3V0UD