PIC24F16KL402 Datasheet, PDF (160/260 Pages) Microchip Technology – Low-Power, Low-Cost, General Purpose 16-Bit Flash Microcontrollers with nanoWatt XLP Technology

PIC24F16KL402 FAMILY
REGISTER 19-2: AD1CON2: A/D CONTROL REGISTER 2
R/W-0
R/W-0
R/W-0
R/W-0
U-0
R/W-0
U-0
VCFG2
VCFG1
VCFG0
OFFCAL⁽¹⁾
—
CSCNA
—
bit 15
U-0
—
bit 8
R-x
—
bit 7
U-0
R/W-0
R/W-0
R/W-0
R/W-0
r-0
R/W-0
—
SMPI3
SMPI2
SMPI1
SMPI0
—
ALTS
bit 0
Legend:
R = Readable bit
-n = Value at POR
r = Reserved bit
W = Writable bit
‘1’ = Bit is set
HSC = Hardware Settable/Clearable bit
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-13
VCFG<2:0>: Voltage Reference Configuration bits
VCFG<2:0>
000
001
010
011
1xx
VR+
AVDD
External VREF+ pin
AVDD
External VREF+ pin
AVDD
VR-
AVSS
AVSS
External VREF- pin
External VREF- pin
AVSS
bit 12
bit 11
bit 10
bit 9-8
bit 7
bit 6
bit 5-2
bit 1
bit 0
OFFCAL: Offset Calibration bit⁽¹⁾
1 = Conversions to get the offset calibration value
0 = Conversions to get the actual input value
Unimplemented: Read as ‘0’
CSCNA: Scan Input Selections for MUX A Input Multiplexer bit
1 = Scan inputs
0 = Do not scan inputs
Unimplemented: Read as ‘0’
Reserved: Ignore this value
Unimplemented: Read as ‘0’
SMPI<3:0>: Sample/Convert Sequences Per Interrupt Selection bits
1111
.
. = Reserved, do not use (may cause conversion data loss)
.
0010
0001
=
Interrupts
at
the
completion
of
conversion
for
each
2^nd
sample/convert
sequence
0000 = Interrupts at the completion of conversion for each sample/convert sequence
Reserved: Always maintain as ‘0’
ALTS: Alternate Input Sample Mode Select bit
1 = Uses MUX A input multiplexer settings for the first sample, then alternates between MUX B and
MUX A input multiplexer settings for all subsequent samples
0 = Always uses MUX A input multiplexer settings
Note 1:
When the OFFCAL bit is set, inputs are disconnected and tied to AVSS. This sets the inputs of the A/D to
zero. Then, the user can perform a conversion. Use of the Calibration mode is not affected by AD1PCFG
contents nor channel input selection. Any analog input switches are disconnected from the A/D Converter
in this mode. The conversion result is stored by the user software and used to compensate subsequent
conversions. This can be done by adding the two’s complement of the result obtained with the OFFCAL bit
set to all normal A/D conversions.
DS31037B-page 160
 2011 Microchip Technology Inc.