Microchip Technology MA330016 Data Sheet
© 2007-2011 Microchip Technology Inc.
DS70290J-page 181
dsPIC33FJ32GP202/204 and dsPIC33FJ16GP304
REGISTER 18-2:
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<3:0>
BUFM
ALTS
bit 7
bit 0
Legend:
R = Readable bit
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: Scan Input Selections for CH0+ during Sample A bit
1 = Scan inputs
0 = Do not scan inputs
1 = Scan inputs
0 = Do not scan inputs
bit 9-8
CHPS<1:0>: Select 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
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 (valid only when BUFM = 1)
1 = ADC is currently filling second half of buffer, user application should access data in the first half
0 = ADC is currently filling first half of buffer, user application should access data in the second half
1 = ADC is currently filling second half of buffer, user application should access data in the first half
0 = ADC is currently filling first half of buffer, user application should access data in the second half
bit 6
Unimplemented: Read as ‘0’
bit 5-2
SMPI<3:0>: Sample/Convert Sequences Per Interrupt Selection bits
1111 = Interrupts at the completion of conversion for each 16th sample/convert sequence
1110 = Interrupts at the completion of conversion for each 15th sample/convert sequence
•
•
•
0001 = Interrupts at the completion of conversion for each 2nd sample/convert sequence
0000 = Interrupts at the completion of conversion for each sample/convert sequence
1111 = Interrupts at the completion of conversion for each 16th sample/convert sequence
1110 = Interrupts at the completion of conversion for each 15th sample/convert sequence
•
•
•
0001 = Interrupts at the completion of conversion for each 2nd sample/convert sequence
0000 = Interrupts at the completion of conversion for each sample/convert sequence
bit 1
BUFM: Buffer Fill Mode Select bit
1 = Starts filling first half of buffer on first interrupt and the second half of buffer on next interrupt
0 = Always starts filling buffer from the beginning
1 = Starts filling first half of buffer on first interrupt and the second half of buffer on next interrupt
0 = Always starts filling buffer from the beginning
bit 0
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
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
ADREF+
ADREF-
000
A
VDD
A
VSS
001
External V
REF
+
A
VSS
010
A
VDD
External V
REF
-
011
External V
REF
+
External V
REF
-
1xx
A
VDD
Avss