4571 Datasheet, PDF (48/126 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

4571 Group
Table 22 Pull-up control registers
Pull-up control register PU0
PU03
Port P03 pull-up transistor
control bit
PU02
Port P02 pull-up transistor
control bit
PU01
Port P01 pull-up transistor
control bit
PU00
Port P00 pull-up transistor
control bit
at reset : 00002
at RAM back-up : state retained
0 Pull-up transistor OFF
1 Pull-up transistor ON
0 Pull-up transistor OFF
1 Pull-up transistor ON
0 Pull-up transistor OFF
1 Pull-up transistor ON
0 Pull-up transistor OFF
1 Pull-up transistor ON
R/W
TAPU0/TPU0A
Pull-up control register PU1
PU13
Port P13 pull-up transistor
control bit
PU12
Port P12 pull-up transistor
control bit
PU11
Port P11 pull-up transistor
control bit
PU10
Port P10 pull-up transistor
control bit
at reset : 00002
at RAM back-up : state retained
0 Pull-up transistor OFF
1 Pull-up transistor ON
0 Pull-up transistor OFF
1 Pull-up transistor ON
0 Pull-up transistor OFF
1 Pull-up transistor ON
0 Pull-up transistor OFF
1 Pull-up transistor ON
Pull-up control register PU2
at reset : 00002
at RAM back-up : state retained
PU23 Not used
0
This bit has no function, but read/write is enabled.
1
PU22 Not used
0
This bit has no function, but read/write is enabled.
1
PU21
Port P21 pull-up transistor
control bit
0 Pull-up transistor OFF
1 Pull-up transistor ON
PU20
Port P20 pull-up transistor
control bit
0 Pull-up transistor OFF
1 Pull-up transistor ON
Note 1.“R” represents read enabled, and “W” represents write enabled.
R/W
TAPU1/TPU1A
R/W
TAPU2/TPU2A
Rev.1.02 May 25, 2007 Page 48 of 124
REJ03B0179-0102