Table of Contents
Advertisement
MB90335 Series
21.4
Explanation of Operation of Address Match Detection
Function
If the addresses of the instructions executed in the program match those set in the
Program address detection registers (PADR0, PADR1), the address match detection
function will replace the first instruction with the INT9 instruction (01
interrupt processing program.
■ Operation of Address Match Detection Function
Figure 21.4-1 shows the operation of the address match detection function when the detect addresses are set
and an address match is detected.
The instruction address to be
executed by program matches
Program address detection register 0
■ Setting Detect Address
1. Disable the Program address detection register 0 (PADR0) where the detect address is set for address
match detection (PACSR: AD0E = 0).
2. Set the detect address in the Program address detection register 0 (PADR0). Set "FF
of the Program address detection register 0 (PADR0), "00
bits.
3. Enable the Program address detection register 0 (PADR0) where the detect address is set for address
match detection (PACSR: AD0E = 1).
■ Program Execution
1. If the address of the instruction to be executed in the program matches the set detect address, the first
instruction code at the matched address is replaced by the INT9 instruction code (01
2. INT9 instruction is executed. INT9 interrupt is generated and then interrupt processing program is
executed.
CM44-10137-6E
21.4 Explanation of Operation of Address Match Detection Function
Figure 21.4-1 Operation of Address Match Detection Function
Program execution
FUJITSU MICROELECTRONICS LIMITED
CHAPTER 21 ADDRESS MATCH DETECTION FUNCTION
Address
Instruction code
FF001C :
A8 00 00
FF001F :
4A 00 00
FF0022 :
4A 80 08
Replaced by INT9 instruction (01
) to branch to the
H
Mnemonic
MOVW
RW0, #0000
MOVW
A, #0000
MOVW
A, #0880
)
H
H
" at the middle bits, and "1F
H
H
" at the higher bits
" at the lower
H
).
467
Advertisement
Table of Contents
