#if defined _CC51
 #define SBIT(name, addr, bit)  _sfrbit  name _at(addr+bit)
 #define SFR(name, addr)        _sfrbyte name _at(addr)
 #define SFR16(name, addr)      /* not supported */
 #define SFR16E(name, fulladdr) /* not supported */
 #define SFR32(name, fulladdr)  /* not supported */
#endif