M306H3FCFP datasheet(73/325 Pages) RENESAS

73 / 325 page

Rev.1.00

2004.03.23

page 73 of 320

M306H3MC-XXXFP/FCFP

2.7.10 Address Match Interrupt

An address match interrupt request is generated immediately before executing the instruction at the ad-

dress indicated by the RMADi register (i=0 to 3). Set the start address of any instruction in the RMADi

to enable or disable the interrupt. Note that the address match interrupt is unaffected by the I flag and IPL.

For address match interrupts, the value of the PC that is saved to the stack area varies depending on the

instruction being executed (refer to “Saving Registers”).

(The value of the PC that is saved to the stack area is not the correct return address.) Therefore, follow one

of the methods described below to return from the address match interrupt.

• Rewrite the content of the stack and then use the REIT instruction to return.

• Restore the stack to its previous state before the interrupt request was accepted by using the POP or

similar other instruction and then use a jump instruction to return.

Table 2.7.6 shows the value of the PC that is saved to the stack area when an address match interrupt

request is accepted.

Note that when using the external bus in 8 bits width, no address match interrupts can be used for external

areas.

Figure 2.7.13 shows the AIER, AIER2, and RMAD0 to RMAD3 registers.

Table 2.7.6. Instruction Just Before Execution and Address Stored in Stack When There Occurs

Interrupts

Table 2.7.7. Relationship Between Address Match Interrupt Sources and Associated Registers

Address match interrupt sources Address match interrupt enable bit

Address match interrupt register

Address match interrupt 0

AIER0

RMAD0

Address match interrupt 1

AIER1

RMAD1

Address match interrupt 2

AIER20

RMAD2

Address match interrupt 3

AIER21

RMAD3

• 16-bit op-code instruction

• Instruction shown below among 8-bit operation code instructions

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 or A1)

Instructions other than the above

Instruction at the address indicated by the RMADi register

Value of the PC that is

saved to the stack area

The address

indicated by the

RMADi register +2

The address

indicated by the

RMADi register +1

Value of the PC that is saved to the stack area : Refer to “Saving Registers”.

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