70592C Datasheet, PDF (214/314 Pages) Microchip Technology – High-Performance, 16-bit Microcontrollers

PIC24HJXXXGPX06A/X08A/X10A
REGISTER 20-2: ADxCON2: ADCx CONTROL REGISTER 2 (where x = 1 or 2)
R/W-0
R/W-0
R/W-0
U-0
U-0
R/W-0
R/W-0
R/W-0
VCFG<2:0>
—
—
CSCNA
CHPS<1:0>
bit 15
bit 8
R-0
BUFS
bit 7
U-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
—
SMPI<3:0>
BUFM
ALTS
bit 0
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 15-13
bit 12-11
bit 10
bit 9-8
bit 7
bit 6
bit 5-2
bit 1
bit 0
VCFG<2:0>: Converter Voltage Reference Configuration bits
VREF+
VREF-
000
AVDD
001 External VREF+
010
AVDD
011 External VREF+
1xx
AVDD
AVSS
AVSS
External VREF-
External VREF-
AVSS
Unimplemented: Read as ‘0’
CSCNA: Scan Input Selections for CH0+ during Sample A bit
1 = Scan inputs
0 = Do not scan inputs
CHPS<1:0>: Selects Channels Utilized bits
When AD12B = 1, CHPS<1:0> is: U-0, Unimplemented, Read as ‘0’
1x = Converts CH0, CH1, CH2 and CH3
01 = Converts CH0 and CH1
00 = Converts CH0
BUFS: Buffer Fill Status bit (only valid when BUFM = 1)
1 = ADC is currently filling second half of buffer, user should access data in first half
0 = ADC is currently filling first half of buffer, user should access data in second half
Unimplemented: Read as ‘0’
SMPI<3:0>: Selects Increment Rate for DMA Addresses bits or number of sample/conversion
operations per interrupt
1111 = Increments the DMA address or generates interrupt after completion of every 16th
sample/conversion operation
1110 = Increments the DMA address or generates interrupt after completion of every 15th
sample/conversion operation
•
•
•
0001 = Increments the DMA address or generates interrupt after completion of every 2nd
sample/conversion operation
0000 = Increments the DMA address or generates interrupt after completion of every
sample/conversion operation
BUFM: Buffer Fill Mode Select bit
1 = Starts filling first half of buffer on first interrupt and second half of buffer on next interrupt
0 = Always starts filling buffer from the beginning
ALTS: Alternate Input Sample Mode Select bit
1 = Uses channel input selects for Sample A on first sample and Sample B on next sample
0 = Always uses channel input selects for Sample A
DS70592C-page 214
© 2011 Microchip Technology Inc.