4502 datasheet(42/116 Pages) RENESAS

42 / 116 page

Rev.3.01

2005.02.02

page 42 of 112

REJ03B0105-0301

4502 Group

Fig. 39 State transition

Fig. 40 Set source and clear source of the P flag

Fig. 41 Start condition identified example using the SNZP in-

struction

Power down flag P

POF or

POF2

instruction

Reset input

q Set source

q Clear source

Reset input

• • • • • • •

• • • • • •

EPOF instruction +

POF or

POF2

instruction

EPOF instruction +

Program start

P = “1”

Yes

Warm start

Cold start

Reset

(Stabilizing

time a )

Operation source clock:

ceramic resonator

On-chip oscillator: stop

RC oscillation circuit: stop

Operation source clock:

on-chip oscillator clock

Ceramic resonator:

operating (Note 2)

RC oscillation circuit: stop

Operation source clock:

RC oscillation

On-chip oscillator: stop

Ceramic resonator: stop

CMCK instruction

execution (Note 3)

CRCK instruction

execution (Note 3)

Voltage drop

detected

Key-on wakeup

(Stabilizing time b )

POF instruction execution

RAM back-up

(Voltage drop detection

circuit is operating.)

Operation source clock: stop

Key-on wakeup

(Stabilizing time c )

POF instruction execution

Key-on wakeup

(Stabilizing time b )

POF2 instruction execution

Key-on wakeup

(Stabilizing time c )

POF2 instruction execution

RAM back-up

(All functions of

microcomputer stop)

Operation source clock: stop

POF instruction execution

Key-on wakeup

(Stabilizing time a )

POF2 instruction execution

Stabilizing time a : Microcomputer starts its operation after counting the on-chip oscillator clock 5359 times by hardware.

Stabilizing time b : Microcomputer starts its operation after counting the f(XIN) 5359 times by hardware.

Stabilizing time c : Microcomputer starts its operation after counting the f(XIN) 165 times by hardware.

Notes 1: Continuous execution of the EPOF instruction and the POF or POF2 instruction is required to go into

the RAM back-up state.

2: Through the ceramic resonator is operating, the on-chip oscillator clock is selected as the operation source clock.

3: The oscillator clock corresponding to each instruction is selected as the operation source clock,

and the on-chip oscillator is stopped.

(Stabilizing time a )

Operating

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