4570 datasheet(34/69 Pages) RENESAS

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MITSUBISHI MICROCOMPUTERS

4570 Group

SINGLE-CHIP 4-BIT CMOS MICROCOMPUTER

Fig. 29 State transition

Power down flag P

POF instruction

Reset input or voltage

drop detection circuit

output

q Set source

POF instruction is executed

q Clear source

Reset input

Software start

P = “1”

Yes

Warm start

Cold start

Fig. 30 Set source and clear source of the P flag

Fig. 31 Start condition identified example using the SNZP

instruction

Table 15 Key-on wakeup control register and pull-up control register

K03

K02

K01

K00

Port P43 key-on wakeup

control bit

Port P42 key-on wakeup

control bit

Port P41 key-on wakeup

control bit

Port P40 key-on wakeup

control bit

Key-on wakeup control register K0

Key-on wakeup not used

Key-on wakeup used

Key-on wakeup not used

Key-on wakeup used

Key-on wakeup not used

Key-on wakeup used

Key-on wakeup not used

Key-on wakeup used

at reset : 00002

at RAM back-up : state retained

R/W

Pull-up transistor OFF

Pull-up transistor ON

Pull-up transistor OFF

Pull-up transistor ON

Pull-up transistor OFF

Pull-up transistor ON

Pull-up transistor OFF

Pull-up transistor ON

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

at reset : 00002

at RAM back-up : state retained

Pull-up control register PU0

R/W

PU03

PU02

PU01

PU00

Note: “R” represents read enabled, and “W” represents write enabled.

: The time required to stabilize f(XIN) oscillation is automatically

generated by hardware.

Stabilizing time a

POF instruction

is executed

f(XIN) oscillation

Return input

(Stabilizing time a )

(RAM back-up

mode)

f(XIN) stop

Reset

(Stabilizing time a )

4570 Datasheet(PDF) 34 Page - Renesas Technology Corp

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