R8C/1A Group, R8C/1B Group 12. Interrupts
Rev.1.30 Dec 08, 2006 Page 98 of 315
REJ09B0252-0130
12.4 Address Match Interrupt
An address match interrupt request is generated immediately before execution of the instruction at the address
indicated by the RMADi register (i = 0, 1). This interrupt is used as a break function by the debugger. When using
the on-chip debugger, do not set an address match interrupt (registers of AIER, RMAD0, and RMAD1 and fixed
vector tables) in a user system.
Set the starting address of any instruction in the RMADi register. Bits AIER0 and AIER1 in the AIER0 register can
be used to select enable or disable of the interrupt. The I flag and IPL do not affect the address match interrupt.
The value of the PC (Refer to 12.1.6.7 Saving a Register for the value of the PC) which is saved to the stack when
an address match interrupt is acknowledged varies depending on the instruction at the address indicated by the
RMADi register. (The appropriate return address is not saved on the stack.) When returning from the address match
interrupt, return by one of the following means:
• Change the content of the stack and use the REIT instruction.
• Use an instruction such as POP to restore the stack as it was before the interrupt request was acknowledged.
Then use a jump instruction.
Table 12.6 lists the Values of PC Saved to Stack when Address Match Interrupt is Acknowledged.
Figure 12.19 shows Registers AIER, and RMAD0 to RMAD1.
NOTES:
1. Refer to the 12.1.6.7 Saving a Register for the PC value saved.
2. Operation code: Refer for the “R8C/Tiny Series Software Manual (REJ09B0001)”.
“Chapter 4. Instruction Code/Number of Cycles” contains diagrams showing
operation code below each syntax. Operation code is shown in the bold frame in
the diagrams.
Table 12.6 Values of PC Saved to Stack when Address Match Interrupt is Acknowledged
Address Indicated by RMADi Register (i = 0,1) PC Value Saved
(1)
• Instruction with 2-byte operation code
(2)
• Instruction shown below among instruction with 1-byte operation code
(2)
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)
Address indicated by
RMADi register + 2
• Instructions other than the above Address indicated by
RMADi register + 1
Table 12.7 Correspondence Between Address Match Interrupt Sources and Associated
Registers
Address Match Interrupt Source Address Match Interrupt Enable Bit Address Match Interrupt Register
Address match interrupt 0 AIER0 RMAD0
Address match interrupt 1 AIER1 RMAD1
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