In infenion Instrction set manual,there are 2 instrctions as follow, MOV Rwn, #data4 E0 #n 2 MOV reg, #data16 E6 RR ## ## 4 where Rwn refers to Word GPR (R0, R1, …, R15); reg refers to SFR/ESFR or GPR In my BIN file there is one machine code"E6 RR ####",for example"E6 F9 00 00",after being disasembled by IDA,the code is transfered to"MOV R9,#0".But when I used KEIL to build it,it is changed into "E0 09",how can I get it back into "E6 F9 00 00"using Keil,Can anyone give me some advice or help?Thanks a lot! wangwei