Pull-Up Resistor Option Registers (Puxx) - Renesas RL78/G1P Hardware User Manual

RL78/G1P

4.3.3 Pull-up resistor option registers (PUxx)

These registers specify whether the on-chip pull-up resistors 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 (PMmn = 1) for the pins to which the use of an on-chip pull-up resistor
has been specified in these registers. On-chip pull-up resistors cannot be connected to bits set to output mode and bits
used as alternate-function output pins and analog setting (PMC = 1), regardless of the settings of these registers.
These registers can be set by a 1-bit or 8-bit memory manipulation instruction.
Reset signal generation clears these registers to 00H (Only PU4 is set to 01H).
Symbol 7 6
Note
PU1 PU17 PU16
PU3 0 0
PU4 0 0
PUmn
0 On-chip pull-up resistor not connected
1 On-chip pull-up resistor connected
Note These are not provided in 24-pin products.
R01UH0895EJ0100 Rev.1.00
Nov 29, 2019
Figure 4-18. Format of Pull-up Resistor Option Register
5 4 3
Note
PU15 PU14 PU13
Note Note
PU35 PU34 PU33
0 0 0
Pmn pin on-chip pull-up resistor selection
CHAPTER 4 PORT FUNCTIONS
2 1 0
Note
PU12 PU11 PU10
PU32 PU31 PU30
0 0 PU40
(m = 0, 1, 4; n = 0 to 7)
Address After reset R/W
F0031H 00H R/W
F0033H 00H R/W
F0034H 01H R/W
87