M30620FCAFP datasheet(475/615 Pages) RENESAS

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Address Match Interrupt

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-158

2.12.1 Overview of the address match interrupt usage

The address match interrupt is used for correcting a ROM or for a simplified debugging-purpose monitor.

The following is an overview of the address match interrupt usage.

(1) Enabling/disabling the address match interrupt

The address match interrupt enable bit can be used to enable and disable an address match interrupt.

It is affected neither by the processor interrupt priority level (IPL) nor the interrupt enable flag (I flag).

(2) Timing of the address match interrupt

An interrupt occurs immediately before executing the instruction in the address indicated by the ad-

dress match interrupt register. Set the first address of the instruction in the address match interrupt

address match interrupt.

The first instruction of an interrupt routine does not generate an address match interrupt either.

(3) Returning from an address match interrupt

The address put in the stack when an address match interrupt occurs depends on the instruction not

yet executed (the instruction the address match interrupt register indicates). The return address is not

put in the stack. For this reason, to return from an address match interrupt, either rewrite the content

of the stack and use the REIT instruction or use the POP instruction to restore the stack to the state as

it was before the interrupt occurred and return by use of a jump instruction.

Figure 2.12.1 shows unexecuted instructions and corresponding the stacked addresses.

2.12 Address Match Interrupt Usage

• 16-bit operation code instructions

• 8-bit operation code instructions given below

ADD.B:S

#IMM8,dest

SUB.B:S

#IMM8,dest

AND.B:S

#IMM8,dest

OR.B:S

#IMM8,dest

MOV.B:S

#IMM8,dest

STZ.B:S

#IMM8,dest

STNZ.B:S

#IMM8,dest

STZX.B:S

#IMM81,#IMM82,dest

CMP.B:S

#IMM8,dest

PUSHM

src

POPM

dest

JMPS

#IMM8

JSRS

#IMM8

MOV.B:S

#IMM,dest (However, dest = A0/A1)

• Instructions other than those listed above

Figure 2.12.1. Unexecuted instructions and corresponding stacked addresses

(4) How to determine an address match interrupt

Address match interrupts can be set at two different locations. However, both location will have the

same vector address. Therefore, it is necessary to determine which interrupt has occurred; address

match interrupt 0 or address match interrupt 1. Using the content of the stack, etc., determine which

interrupt has occurred according to the first part of the address match interrupt routine.

M30620FCAFP Datasheet(PDF) 475 Page - Renesas Technology Corp

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