Hi, I am looking for a way to write some C51 functions to set or clear bits stored in the 8051 external data memory. For example, the following code was done in the 8051 assembly language:
;******************************* SYSTEM_TROUBLE1 XDATA 1000H AC_FAIL ACC.0 LOW_BAT ACC.1 . . SYSTEM_TROUBLE2 XDATA 1001H TELCO1_FAIL ACC.0 TELCO2_FAIL ACC.1 . . ;******************************* . . MOV DPTR, #SYSTEM_TROUBLE1 MOVX A, @DPTR SETB AC_FAIL MOVX @DPTR . .
Opps, sorry, I picked the wrong flag to test. You are correct, bit fields are inefficient. Uhhhh. You only tested one case of bit-fields -- a 1-bit bit-field. I would make more tests before making such a broad, sweeping statement. Anyway, what is so inefficient about the code that was generated? Jon