RL78/G13 CHAPTER 4 PORT FUNCTIONS
R01UH0146EJ0100 Rev.1.00 262
Sep 22, 2011
(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.
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 4-67. Format of Pull-up Resistor Option Register (128-pin products)
Symbol 7 6 5 4 3 2 1 0 Address After reset R/W
PU0 PU07 PU06 PU05 PU04 PU03 PU02 PU01 PU00 F0030H 00H R/W
PU1 PU17 PU16 PU15 PU14 PU13 PU12 PU11 PU10 F0031H 00H R/W
PU3 PU37 PU36 PU35 PU34 PU33 PU32 PU31 PU30 F0033H 00H R/W
PU4 PU47 PU46 PU45 PU44 PU43 PU42 PU41 PU40 F0034H 01H R/W
PU5 PU57 PU56 PU55 PU54 PU53 PU52 PU51 PU50 F0035H 00H R/W
PU6 PU67 PU66 PU65 PU64 0 0 0 0 F0036H 00H R/W
PU7 PU77 PU76 PU75 PU74 PU73 PU72 PU71 PU70 F0037H 00H R/W
PU8 PU87 PU86 PU85 PU84 PU83 PU82 PU81 PU80 F0038H 00H R/W
PU9 PU97 PU96 PU95 PU94 PU93 PU92 PU91 PU90 F0039H 00H R/W
PU10 0 PU106 PU105 PU104 PU103 PU102 PU101 PU100 F003AH 00H R/W
PU11 PU117 PU116 PU115 PU114 PU113 PU112 PU111 PU110 F003BH 00H R/W
PU12 PU127 PU126 PU125 0 0 0 0 PU120 F003CH 00H R/W
PU14 PU147 PU146 PU145 PU144 PU143 PU142 PU141 PU140 F003EH 00H R/W
PUmn
Pmn pin on-chip pull-up resistor selection
(m = 0, 1, 3 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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