Operation Of The Address Match Detection Function - Fujitsu MB90390 Series Hardware Manual

26.3

Operation of the Address Match Detection Function

If the program counter specifies the same address as the address match detection
register, the INT9 instruction is executed. The address match detection function can be
achieved by processing the INT9 instruction routine.
■ Operation of the Address Match Detection Function
There are 5 address detection registers with a compare enable bit. When the value set in the address
detection register and the value of the program counter match and the compare enable bit is set to "1", the
CPU executes the INT9 instruction.
Note:
If the value of the address detection register and the value of the program counter match, the
contents of internal data bus is changed to "01
Before changing the contents of the address detection register, always set the compare enable bit to
"0". While the compare enable bit is set to "1", changing the contents of the address detection
register may result in a malfunction.
CHAPTER 26 ADDRESS MATCH DETECTION FUNCTION
". Consequently, the INT9 instruction is executed.
H
547