4570 Datasheet, PDF (53/69 Pages) Renesas Technology Corp – SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

MITSUBISHI MICROCOMPUTERS
4570 Group
SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER
CONTROL REGISTERS (CONTINUED)
Carrier wave output control register C2
at reset : 002
at RAM back-up : 002
W
C21 Port CARR output control bit
C20 Carrier wave output auto-control bit
0 Port CARR “L” level output
1 Port CARR “H” level output
0 ^{Auto-control output by timer 1 is invalid}
1 ^{Auto-control output by timer 1 is valid}
Key-on wakeup control register K0
Port P43 key-on wakeup
K03
control bit
Port P42 key-on wakeup
K02 _{control bit}
Port P41 key-on wakeup
K01 _{control bit}
Port P40 key-on wakeup
K00
control bit
at reset : 00002
at RAM back-up : state retained R/W
0 Key-on wakeup not used
1 Key-on wakeup used
0 Key-on wakeup not used
1 Key-on wakeup used
0 Key-on wakeup not used
1 Key-on wakeup used
0 Key-on wakeup not used
1 Key-on wakeup used
Pull-up control register PU0
PU03
PU02
PU01
PU00
Port P43 pull-up transistor
control bit
Port P42 pull-up transistor
control bit
Port P41 pull-up transistor
control bit
Port P40 and P01 pull-up transistor
control bit
Clock control register MR
MR3 System clock selection bit
MR2 Not used
MR1 Not used
MR0 Not used
at reset : 00002
at RAM back-up : state retained R/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
at reset : 10002
at RAM back-up : state retained
0 f(XIN)
1 f(XIN)/4
0
This bit has no function, but read/write is enabled.
1
0
This bit has no function, but read/write is enabled.
1
0
This bit has no function, but read/write is enabled.
1
R/W
8-bit general purpose register PU0
at reset : 0016
at RAM back-up : state retained R/W
8-bit general purpose register.
8-bit data can be transferred between this register PU0 and registers A and B with the TSIAB instruction and TABSI instruction.
Note: “R” represents read enabled, and “W” represents write enabled.
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