P89C669 user manual page 71 indicate I2CON (91h) is bit addressable.! How can declare to compiler? My custom header file for P89C669 ; sfr I2CON = 0x91; sbit I2EN = I2CON^6; sbit STA = I2CON^5; sbit STO = I2CON^4; sbit SI = I2CON^3; sbit AA = I2CON^2; sbit CRSEL = I2CON^0; When compiled REG669.H(246): error A17: INVALID BASE IN BIT ADDRESS EXPRESSION