D17133CS datasheet(262/289 Pages) NEC

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CHAPTER 18

INSTRUCTION SET

247

18.5.10 Interrupt Instructions

(1)

Enable Interrupt

<1> OP code

00111

000

1111

0000

<2> Function

INTEF

← 1

Enables a vectored interrupt.

The interrupt is enabled, after the instruction next to the EI instruction has been executed.

<3> Example 1

As shown in the following example, the interrupt request is accepted after the instruction next to that, that

has accepted the interrupt, has been completely executed (excluding an instruction that manipulates program

counter). The flow then shifts to the vector addressNote1.

Notes 1.

The vector address differs, depending on the interrupt to be accepted. Refer to Table 14-

1 Interrupt Source Types.

Generating

interrupt request

MOV

ADD

0AH,

0BH,

0CH,

#00H

#01H

Generating

interrupt request

MOV

SUB

0AH,

0BH,

#01H

RET

Note 2

Interrupt service

Routine (vecter address)

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