Renesas 6NM Manual De Usuario

Rev.1.10    Jul 01, 2005    page 78 of 318
REJ09B0124-0110

M16C/6N Group (M16C/6NK, M16C/6NM)

9. Interrupt

This document is under development and its contents are subject to change.

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

register. Use the AIER0 and AIER1 bits in the AIER register and the AIER20 and AIER21 bits in the AIER2

register 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 9.5.7 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 9.6 shows the value of the PC that is saved to the stack area when an address match interrupt

request is accepted.

Table 9.7 shows the relationship between address match interrupt sources and associated registers.

Figure 9.16 shows the AIER, AIER2, and RMAD0 to RMAD3 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

Instruction at Address Indicated by RMADi Register

 • 16-bit operation code

 • 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

Value of PC that is saved to stack area: Refer to 9.5.7 Saving Registers.

Value of PC that is Saved to Stack Area

 Address indicated by RMADi

 register + 2

 Address indicated by RMADi

 register + 1