RL78/G1H CHAPTER 5 PORT FUNCTIONS
R01UH0575EJ0120 Rev. 1.20 Page 80 of 920
Dec 22, 2016
5.3.3 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 and POMmn = 0) 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, regardless of the settings of
these registers. Similarly, on-chip pull-up resistors cannot be connected to the pins used as alternate-function
output pins and the pins set to the analog function.
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).
Figure 5 - 3 Format of Pull-up resistor option register
Caution Be sure to set bits that are not mounted to their initial values.
Symbol76543210 Address After reset R/W
PU0 0 0 0 PU04 PU03 PU02 0 0 F0030H 00H R/W
PU1 0 PU16 PU15 PU14 PU13 PU12 PU11 PU10 F0031H 00H R/W
PU3000000PU31PU30F0033H 00H R/W
PU40000000PU40F0034H 01H R/W
PU7 PU77 PU76 PU75 0 0 PU72 PU71 PU70 F0037H 00H R/W
PU800000PU82PU81PU80F0038H 00H R/W
PU100000000PU100F003AH 00H R/W
PU120000000PU120F003CH 00H R/W
PU14 0 0 0 PU144 PU143 PU142 PU141 PU140 F003EH 00H R/W
PUmn Pmn pin on-chip pull-up resistor selection (m = 0, 1, 3 to 8, 10 to 12, 14; n = 0 to 7)
0 On-chip pull-up resistor not connected
1 On-chip pull-up resistor connected
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