Datasheet

© 2009-2012 Microchip Technology Inc. Preliminary DS70616F-page 417
dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
REGISTER 23-2: AD1CON2: ADC1 CONTROL REGISTER 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 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
BUFS SMPI<4:0> BUFM ALTS
bit 7 bit 0
Legend:
R = Readable bit W = Writable bit U = Unimplemented bit, read as ‘0’
-n = Value at POR ‘1’ = Bit is set ‘0’ = Bit is cleared x = Bit is unknown
bit 15-13 VCFG<2:0>: Converter Voltage Reference Configuration bits
bit 12-11 Unimplemented: Read as ‘0’
bit 10 CSCNA: Input Scan Select bit
1 = Scan inputs for CH0+ during Sample A bit
0 = Do not scan inputs
bit 9-8 CHPS<1:0>: Channel Select 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
bit 7 BUFS: Buffer Fill Status bit (only valid when BUFM = 1)
1 = ADC is currently filling the second half of the buffer. The user application should access data in the
first half of the buffer
0 = ADC is currently filling the first half of the buffer. The user application should access data in the
second half of the buffer.
bit 6-2 SMPI<4:0>: Increment Rate bits
When ADDMAEN =
0:
01111 = Generates interrupt after completion of every 16th sample/conversion operation
01110 = Generates interrupt after completion of every 15th sample/conversion operation
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•
•
00001 = Generates interrupt after completion of every 2nd sample/conversion operation
00000 = Generates interrupt after completion of every sample/conversion operation
When ADDMAEN =
1:
11111 = Increments the DMA address after completion of every 32nd sample/conversion operation
11110 = Increments the DMA address after completion of every 31st sample/conversion operation
•
•
•
00001 = Increments the DMA address after completion of every 2nd sample/conversion operation
00000 = Increments the DMA address after completion of every sample/conversion operation
VREFH VREFL
000 AVDD Avss
001 External V
REF+ Avss
010 A
VDD External VREF-
011 External V
REF+ External VREF-
1xx A
VDD Avss