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
ALl the "Bit Addressable" SFRs are indicated, in the datasheet, with light blue lettering above the bits. There's no error there. The 91H is black and to the left.