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188

CHAPTER 12 INTERRUPT FUNCTION

Table 12-4. Interrupt Request Enabled for Multiple Interrupt during Interrupt Servicing

Maskable Interrupt Request

PR=0 PR=1

IE=1 IE=0 IE=1 IE=0

Non-maskable interrupt D DDDD

Maskable interrupt ISP=0 E E D D D

ISP=1 E E D E D

Software interrupt E E D E D

Remarks 1. E : Multiple interrupt enable

2. D : Multiple interrupt disable

3. ISP and IE are the flags contained in PSW

ISP=0 : An interrupt with higher priority is being serviced

ISP=1 : An interrupt request is not accepted or an interrupt with lower priority is being

serviced

IE=0 : Interrupt request acknowledge is disabled

IE=1 : Interrupt request acknowledge is enabled

4. PR is a flag contained in PR0L, PR0H, and PR1L

PR=0 : Higher priority level

PR=1 : Lower priority level

Interrupt

during

processing

Non-maskable

Interrupt

Request

Multiple Interrupt

Request

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