
2010-2012 Microchip Technology Inc.
DS41414D-page 169
PIC16(L)F1946/47
REGISTER 16-2:
ADCON1: A/D CONTROL REGISTER 1
R/W-0/0
U-0
R/W-0/0
ADFM
ADCS<2:0>
—
ADNREF
ADPREF<1:0>
bit 7
bit 0
Legend:
R = Readable bit
W = Writable bit
U = Unimplemented bit, read as ‘0’
u = Bit is unchanged
x = Bit is unknown
-n/n = Value at POR and BOR/Value at all other Resets
‘1’ = Bit is set
‘0’ = Bit is cleared
bit 7
ADFM:
A/D Result Format Select bit
1 = Right justified. Six Most Significant bits of ADRESH are set to ‘0’ when the conversion result is
loaded.
0 = Left justified. Six Least Significant bits of ADRESL are set to ‘0’ when the conversion result is
loaded.
bit 6-4
ADCS<2:0>:
A/D Conversion Clock Select bits
111 =FRC (clock supplied from a dedicated RC oscillator)
110 =FOSC/64
101 =FOSC/16
100 =FOSC/4
011 =FRC (clock supplied from a dedicated RC oscillator)
010 =FOSC/32
001 =FOSC/8
000 =FOSC/2
bit 3
Unimplemented:
Read as ‘0’
bit 2
ADNREF:
A/D Negative Voltage Reference Configuration bit
1 =VREF- is connected to external VREF- pin(1)
0 =VREF- is connected to VSS
bit 1-0
ADPREF<1:0>:
A/D Positive Voltage Reference Configuration bits
11 =VREF+ is connected to internal Fixed Voltage Reference (FVR) module(1)
10 =VREF+ is connected to external VREF+ pin(1)
01 = Reserved
00 =VREF+ is connected to VDD
Note 1:
When selecting the FVR or the VREF+ pin as the source of the positive reference, be aware that a