4501_M Datasheet, PDF (124/212 Pages) Renesas Technology Corp – 4-BIT CISC SINGLE-CHIP MICROCOMPUTER 4500 SERIES

4501 Group
APPLICATION
2.1 I/O pins
(5) Key-on wakeup control register K2
Register K2 controls the ON/OFF of the key-on wakeup function of ports P20, P21, D2/C and D3/K.
Set the contents of this register through register A with the TK2A instruction.
The contents of register K2 is transferred to register A with the TAK2 instruction.
Table 2.1.5 shows the key-on wakeup control register K2.
Table 2.1.5 Key-on wakeup control register K2
Key-on wakeup control register K2
at reset : 00002 at RAM back-up : state retained
Port D3/K
K23
key-on wakeup control bit
0 Key-on wakeup invalid
1 Key-on wakeup valid
Port D2/C
K22
key-on wakeup control bit
0 Key-on wakeup invalid
1 Key-on wakeup valid
Port P21/AIN1
K21
key-on wakeup control bit
0 Key-on wakeup invalid
1 Key-on wakeup valid
Port P20/AIN0
K20
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
(6) Pull-up control register PU2
Register PU2 controls the ON/OFF of the ports P20, P21, D2/C and D3/K pull-up transistor.
Set the contents of this register through register A with the TPU2A instruction.
Table 2.1.6 shows the pull-up control register PU2.
Table 2.1.6 Pull-up control register PU2
Pull-up control register PU2
at reset : 00002 at RAM back-up : state retained W
Port D3/K
PU23
pull-up transistor control bit
Port D2/C
PU22
pull-up transistor control bit
Port P21/AIN1
PU21
pull-up transistor control bit
Port P20/AIN0
PU20
pull-up transistor control bit
Note: “W” represents write enabled.
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 07, 2005
2-7
REJ09B0192-0201