4518 datasheet(64/160 Pages) RENESAS

64 / 160 page

Rev.3.01

2005.06.15

page 64 of 157

REJ03B0008-0301

4518 Group

Fig. 53 State transition

Fig. 54 Set source and clear source of the P flag

Fig. 55 Start condition identified example using the SNZP in-

struction

Operation state

• Operation source clock:

f(RING)

• f(XIN): Stop

Key-on wakeup

POF instruction

execution

RAM back-up mode

• Operation source clock:

f(XIN)

• f(RING): Stop

POF instruction

execution

Operation state

Notes 1: Microcomputer starts its operation after counting f(RING) 120 to 144 times.

POF instruction

execution

Operation state

• Operation source clock:

f(XIN)

• f(RING): Operating

POF instruction

execution

Operation state

• Operation source clock:

f(RING)

• f(XIN): Operating

f(RING): stop

f(XIN): stop

MR1

←1

MR1

←0

(Note 5)

(Note 4)

MR0

←1

MR0

←0

RG0

←0

RG0

←1

Reset

(Note 1)

(Note 2)

(Note 3)

However, the selected contents (CMCK, CRCK, CYCK instruction execution state) of f(XIN) oscillation circuit is retained.

5: System returns to state A certainly when returning from the RAM back-up mode.

4: Continuous execution of the EPOF instruction and the POF instruction is required to go into the RAM back-up state.

3: Generate the wait time by software until the oscillation is stabilized, and then, switch the system clock.

MR1 cannot be cleared to “0” when the oscillation circuit is not selected.

Surely, select the f(XIN) oscillation circuit by executing the CMCK, CRCK or CYCK instruction before clearing MR1 to “0”.

The start/stop of oscillation and the operation source is switched by register MR.

instruction starts oscillatng (the start of oscillation and the operation source clock is not switched by these instructions).

2: The f(XIN) oscillation circuit (ceramic resonance, RC oscillation or quartz-crystal oscillation) selected by the CMCK, CRCK or CYCK

Power down flag P

POF

instruction

Reset input

q Set source

q Clear source

Reset input

• • • •• • •

• • •• • •

EPOF

instruction +

POF instruction

EPOF instruction +

Program start

P = “1”

Yes

Warm start

Cold start

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