SM8521 datasheet(27/56 Pages) SHARP

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SM8521

- 27 -

Standby Function

The

standby

function

which

temporarily stops program execution so as to

conserve power. The standby mode is when the

chip enters temporary stop state from the operating

state, executing program. It contains both STOP

and HALT modes, either of which can be selected

according to your desires.

If the CPU executes the STOP mode or HALT

mode, the chip will switch to standby mode from an

operating mode. If the wake up source of the

standby mode encounters an interrupt the chip

returns to operating mode from the standby mode.

Fig. 11 shows its state transition diagram.

External reset request

Warming up

end

HALT instruction

execution

HALT mode

wake up source

STOP instruction

execution

Hardware Reset

Normal Operation

Operating Mode

HALT Mode

STOP Mode

Standby Mode

STOP mode

wake up source

Internal/external

reset request

NOTE : When the chip wakes up from STOP mode, it returns to operating mode behind warming up period.

Fig. 11

State Transition Diagram

NOTE :

The STOP instruction is also used for clock change function,

which its operation is different from switching the chip to

STOP mode, take care to use it.

SM8521 Datasheet(PDF) 27 Page - Sharp Corporation

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