NEC 78K0S/KA1+ Preliminary User's Manual page 60

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(4) Pull-up resistor option registers (PU2, PU3, PU4, PU12)
These registers are used to specify whether an on-chip pull-up resistor is connected to P20 to P23, P30, P31,
P40 to P45, and P123. By setting PU2, PU3, PU4, or PU12, an on-chip pull-up resistor can be connected to
the port pin corresponding to the bit of PU2, PU3, PU4, or PU12.
PU2, PU3, PU4, and PU12 are set by using a 1-bit or 8-bit memory manipulation instruction.
Reset input set these registers to 00H.
Address: FF32H, After reset: 00H R/W
Symbol 7
PU2 0
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Address: FF33H, After reset: 00H R/W
Symbol 7
PU3
0
Address: FF34H, After reset: 00H R/W
Symbol 7
PU4 0
Address: FF3CH, After reset: 00H R/W
Symbol 7
PU12 0
PUmn
0
1
60
CHAPTER 4 PORT FUNCTIONS
Figure 4-15. Format of Pull-up Resistor Option Register
6 5
0 0
6 5
0 0
6 5
0 PU45
6 5
0 0
Selection of connection of on-chip pull-up resistor of Pmn (m = 2, 3, 4, or 12; n = 0 to 7)
Does not connect on-chip pull-up resistor
Connects on-chip pull-up resistor
Preliminary User's Manual U16898EJ1V0UD
4 3 2
0 PU23 PU22
4 3 2
0 0 0
4 3 2
PU44 PU43 PU42
4 3 2
0 PU123 0
1 0
PU21 PU20
1 0
PU31 PU30
1 0
PU41 PU40
1 0
0 0