Hi Douglas-san,
Thanks for your advise. I'll refer them on use of assembler in future.
At this time, the main reason why I have to use assembler is that I'd like to
avoid interrupt onwhile changing Interrupt Mask Register.
As you know, 0xfffff305 is Dragonball Interrupt Mask Register address.
"Douglas>00000000: 4E56 0000 link a6,#0
"Douglas>00000004: 1038 F305 move.b 0xfffff305,d0
I guess that if some Interrupt occured here, unfortunately the handler change
mask!
"Douglas>00000008: 0240 00FB andi.w #0xfb,d0
"Douglas>0000000C: 11C0 F305 move.b d0,0xfffff305
Here writing value is not correct.
"Douglas>00000010: 4E5E unlk a6
"Douglas>00000012: 4E75 rts
Thanks, Ciao!
Kazushige Matsui
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