UPD17218 datasheet(49/84 Pages) NEC

49 / 84 page

µPD17215, 17216, 17217, 17218

8.4

STOP Instruction Execution Conditions

The STOP instruction can be executed, only under special conditions, as shown in Table 8-5, to prevent the program

from hangup.

If the conditions in Table 8-5 are not satisfied, the STOP instruction is treated as an NOP instruction.

Table 8-5

STOP Instruction Execution Conditions

Operand Value

Execution Conditions

1000B (08H)

High level input for all P0A0-P0A3 and P0B0-P0B3 pins

Others

Inhibited

8.5

Releasing Standby Mode

Operations for releasing the STOP and HALT modes will be as shown in Fig. 8-1.

Fig. 8-1

Operations After Standby Mode Release

(a)

Releasing STOP mode by interrupt

Stanby

release signal

STOP

instruction

Wait

(time set by TMM)

Operation

mode

STOP mode

HALT mode

Operation

mode

Clock

Oscillation

Oscillation stops

Oscillation

(b)

Releasing HALT mode by interrupt

HALT

instruction

Stanby

release signal

Clock

Operation

mode

Operation

mode

HALT mode

Oscillation

Remark:

The dotted line indicates the operation to be performed when the interrupt request, releasing the

standby mode, has been accepted.

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