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SFR explanation for PIC16F873(14)

ADRESH,ADRESL ( A/D Result Registers ) 1Eh, 9Eh A/D conversion result is loaded to these registers. Two registers are combined and works as a 16 bits register. The A/D module gives the flexibility to left or right justify the 10 bits result in the 10 bits result register. ADCON0 ( A/D converter control register 0 ) 1Fh The A/D converter condition is controlled with this register. The value in the parenthesis is in the condition immediately after the turning on. ADCS1,ADCS0 : A/D conversion clock select bits ADCS1 ADCS0 Clock 0 0 Fosc/2 0 1 Fosc/8 1 0 Fosc/32 1 1 RC In case of RC, the clock is driven from an RC oscillator. CHS2,CHS1,CHS0 : Analog channel select bits CHS2 CHS1 CHS0 Input channel 0 0 0 Channel 0 ( RA0/AN0 ) 0 0 1 Channel 1 ( RA1/AN1 ) 0 1 0 Channel 2 ( RA2/AN2 ) 0 1 1 Channel 3 ( RA3/AN3 ) 1 0 0 Channel 4 ( RA5/AN4 ) 1 0 1 Unimplemented For PIC16F874/877 1 1 0 1 1 1 GO/DONE : A/D conversion status bit 1 : A/D conversion in progress 0 : A/D conversion not in progress ( This bit is automatically cleared by hardware ) ADON : A/D ON bit 1 : A/D conversion module is operating 0 : A/D conversion module is shutoff and operating current ADCON1 ( A/D converter control register 1 ) 9Fh The A/D converter condition is controlled with this register. The value in the parenthesis is in the condition immediately after the turning on. ADFM : A/D result format select 1 : Right justified. 6 most significant bits of ADRESH are read as 0. 0 : Left justified. 6 least significant bits of ADRESL are read as 0. PCFG3,PCFG2,PCFG1,PCFG0 : A/D port configuration control bits PCFG 3210 Port Remarks AN4 AN3 AN2 AN1 AN0 0000 A A A A A 0001 A VREF+ A A A 0010 A A A A A Same as 0000 0011 A VREF+ A A A Same as 0001 0100 D A D A A 0101 D VREF+ D A A 0110 D D D D D 0111 D D D D D Same as 0110 1000 A VREF+ VREF- A A 1001 A A A A A Same as 0000 1010 A VREF+ A A A Same as 0001 1011 A VREF+ VREF- A A Same as 1000 1100 A VREF+ VREF- A A Same as 1000 1101 D VREF+ VREF- A A 1110 D D D D A 1111 D VREF+ VREF- D A A: Analog port D: Digital port VREF+: High reference voltage VREF-: Low reference voltage