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Why the KEIL C51 8.18 generate fault result?

I use a temp reg to store the data of ADDH reg of my adc. but when i read it after it's convertion finished,the data read into temp is not equ the data in ADDH reg(the address of the ADDH reg is 0xAC)?
I put a screenshots here:
space.ednchina.com/.../3885d829-1143-4871-aa72-0253a58ae7ad.jpg

Thanks!

Chris

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