UPD784021 datasheet(45/90 Pages) NEC

45 / 90 page

mPD784020, 784021

9.2

VECTORED INTERRUPT

When a branch to an interrupt handling routine occurs, the vector table address corresponding to the interrupt

source is used as the branch address.

Interrupt handling by the CPU consists of the following operations :

• When a branch occurs : Push the CPU status (PC and PSW contents) to the stack.

• When control is returned: Pop the CPU status (PC and PSW contents) from the stack.

To return control from the handling routine to the main routine, use the RETI instruction. The branch destination

addresses must be within the range of 0 to FFFFH.

Table 9-3 Vector Table Address

Interrupt source

Vector table address

BRK instruction

003EH

Operand error

003CH

NMI

0002H

WDT

0004H

INTP0

0006H

INTP1

0008H

INTP2

000AH

INTP3

000CH

INTC00

000EH

INTC01

0010H

INTC10

0012H

INTC11

0014H

INTC20

0016H

INTC21

0018H

INTC30

001AH

INTP4

001CH

INTP5

001EH

INTAD

0020H

INTSER

0022H

INTSR

0024H

INTCSI1

INTST

0026H

INTCSI

0028H

INTSER2

002AH

INTSR2

002CH

INTCSI2

INTST2

002EH

UPD784021 Datasheet(PDF) 45 Page - NEC

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