4507_M Datasheet, PDF (121/216 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 4500 SERIES

4507 Group
APPLICATION
2.1 I/O pins
2.1.2 Related registers
(1) Key-on wakeup control register K0
Register K0 controls the ON/OFF of the key-on wakeup function of ports P00–P03.
Set the contents of this register through register A with the TK0A instruction.
The contents of register K0 is transferred to register A with the TAK0 instruction.
Table 2.1.1 shows the key-on wakeup control register K0.
Table 2.1.1 Key-on wakeup control register K0
Key-on wakeup control register K0
at reset : 00002 at RAM back-up : state retained
Port P03
K03
key-on wakeup control bit
0 Key-on wakeup invalid
1 Key-on wakeup valid
Port P02
K02
key-on wakeup control bit
0 Key-on wakeup invalid
1 Key-on wakeup valid
Port P01
K01
key-on wakeup control bit
0 Key-on wakeup invalid
1 Key-on wakeup valid
Port P00
K00
key-on wakeup control bit
0 Key-on wakeup invalid
1 Key-on wakeup valid
Note: “R” represents read enabled, and “W” represents write enabled.
R/W
(2) Pull-up control register PU0
Register PU0 controls the ON/OFF of the ports P00–P03 pull-up transistor.
Set the contents of this register through register A with the TPU0A instruction.
Table 2.1.2 shows the pull-up control register PU0.
Table 2.1.2 Pull-up control register PU0
Pull-up control register PU0
Port P03
PU03
pull-up transistor control bit
Port P02
PU02
pull-up transistor control bit
Port P01
PU01
pull-up transistor control bit
Port P00
PU00
pull-up transistor control bit
Note: “W” represents write enabled.
at reset : 00002 at RAM back-up : state retained W
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
Rev.2.01 Feb 04, 2005
2-6
REJ09B0195-0201