Overview Of Address Match Detection Function - Fujitsu MB90895 Series Hardware Manual

CHAPTER 17 Address Match Detecting Function
17.1

Overview of Address Match Detection Function

If the address of the instruction to be processed next after the instruction currently
being processed by the program matches the address set in the detect address setting
registers, the address match detection function forcibly replaces the next instruction to
be INT9 instruction, and branches to interrupt processing program. Since the address
match detection function can use the INT9 interrupt for instruction processing, the
program can be corrected by patch processing.
I Overview of Address Match Detection Function
• The address of the instruction to be processed next after the instruction currently processed by the
program is always held in the address latch through the internal bus.The address match detection
function always compares the value of the address held in the address latch with that of the address set
in the detect address setting registers.When these compared values match, the next instruction to be
processed by the CPU is forcibly replaced by the INT9 instruction, and the interrupt processing program
is executed.
• There are two detect address setting registers (PADR0 and PADR1), each of which has an interrupt
enable bit.The generation of an interrupt due to a match between the address held in the address latch
and the address set in the detect address setting registers can be enabled and disabled for each register.
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