#include <intrins.h>

void _bfld_ (
  unsigned int sfr,      /* the SFR name */
  int mask,              /* the data bits mask */
  int data);             /* the data value */

The _bfld_ function generates a BFLDL instruction, a BFLDH instruction, or both on sfr depending on the value of the mask and data parameters. This routine is implemented as an intrinsic function. The code required is generated inline rather than being a function call.

None.

1    #include <intrins.h>
2    #include <reg166.h>
3
4    void main (void)  {
5      _bfld_ (P0, 0xFFFF, 0x0101);
6      _bfld_ (P1, 0x00F0, 0x0010);
7      _bfld_ (P0, 0xF000, 0x2000);
8    }

ASSEMBLY LISTING OF GENERATED OBJECT CODE

             ; FUNCTION main (BEGIN  RMASK = @0x4000)
                                     ; SOURCE LINE # 4
                                     ; SOURCE LINE # 5
0000 1A8001FF      BFLDH   P0,#0FFH,#01H
0004 0A80FF01      BFLDL   P0,#0FFH,#01H
                                     ; SOURCE LINE # 6
0008 0A82F010      BFLDL   P1,#0F0H,#010H
                                     ; SOURCE LINE # 7
000C 1A8020F0      BFLDH   P0,#0F0H,#020H
                                     ; SOURCE LINE # 8
0010 CB00          RET
             ; FUNCTION main (END    RMASK = @0x4000)