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CHAPTER 26 ADDRESS MATCH DETECTION FUNCTION
26.1
Outline of the Address Match Detection Function
When an address matches the value set in the address detection register, the
instruction code to be read by the CPU is replaced with the INT9 instruction code (01
Consequently, the CPU executes the INT9 instruction when executing a specified
instruction. The address match detection function can be achieved using the INT9
interrupt routine for processing.
There are 5 address detection registers, each with an interrupt permission bit. When an
address matches the value set in the address detection register and the interrupt
permission bit is "1", the instruction code to be read by the CPU is replaced with the
INT9 instruction code.
■ Block Diagram of the Address Match Detection Function
Figure 26.1-1 Block Diagram of the Address Match Detection Function
2
F
MC-16LX bus
544
Address latch
Address detection
register
Permission bit
INT9
instruction
2
F
MC-16LX
CPU core
).
H
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