UPD17231 datasheet(60/94 Pages) RENESAS

60 / 94 page

Data Sheet U14360EJ1V0DS00

µPD17230, 17231, 17232, 17233, 17234, 17235, 17236

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 hang-up.

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)

<1> High level input for all P0A0-P0A3 pins

<2> When P0B0-P0B3, P0C0-P0C3, and P0D0-P0D3 are used as input pins and all pins are high

<3> If the INT pin interrupt request flag (IRQ) for an interrupt for which the INT pin interrupt

enable flag (IP) is set is reset

Other than above

Setting prohibited

8.5

Releasing Standby Mode

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

Figure 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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