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Microchip Technology MA330031-2 Data Sheet

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 2011-2013 Microchip Technology Inc.
DS70000657H-page 327
dsPIC33EPXXXGP50X, dsPIC33EPXXXMC20X/50X AND PIC24EPXXXGP/MC20X
     
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
VCFG2
VCFG1
VCFG0
—
—
CSCNA
CHPS1
CHPS0
bit 15
bit 8
R-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
R/W-0
BUFS
SMPI4
SMPI3
SMPI2
SMPI1
SMPI0
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
 = Scans inputs for CH0+ during Sample MUXA
0
 = Does not scan inputs
bit 9-8
CHPS<1:0>:
 Channel Select bits
In 12-bit mode (AD21B = 1), the CHPS<1:0> bits are Unimplemented and are 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:
x1111
 = Generates interrupt after completion of every 16th sample/conversion operation
x1110
 = Generates interrupt after completion of every 15th sample/conversion operation
•
•
•
x0001
 = Generates interrupt after completion of every 2nd sample/conversion operation
x0000
 = 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
Value
V
REFH
V
REFL
000
A
VDD
Avss
001
External V
REF
+
Avss
010
A
VDD
External V
REF
-
011
External V
REF
+
External V
REF
-
1xx
A
VDD
A
VSS