Datasheet
© 2009-2012 Microchip Technology Inc. Preliminary DS70616F-page 415
dsPIC33EPXXX(GP/MC/MU)806/810/814 and PIC24EPXXX(GP/GU)810/814
23.4 ADC Control Registers
REGISTER 23-1: ADxCON1: ADCx CONTROL REGISTER 1
R/W-0 U-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0
ADON
—ADSIDLADDMABM—AD12B
(1)
FORM<1:0>
bit 15 bit 8
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0, HSC R/C-0, HSC
SSRC<2:0> SSRCG SIMSAM ASAM
(3)
SAMP DONE
(3)
bit 7 bit 0
Legend: HSC = Set or Cleared by Hardware
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 ADON: ADC Operating Mode bit
1 = ADC module is operating
0 = ADC is off
bit 14 Unimplemented: Read as ‘0’
bit 13 ADSIDL: Stop in Idle Mode bit
1 = Discontinue module operation when device enters Idle mode
0 = Continue module operation in Idle mode
bit 12 ADDMABM: DMA Buffer Build Mode bit
1 = DMA buffers are written in the order of conversion. The module provides an address to the DMA
channel that is the same as the address used for the non-DMA stand-alone buffer.
0 = DMA buffers are written in Scatter/Gather mode. The module provides a Scatter/Gather address
to the DMA channel, based on the index of the analog input and the size of the DMA buffer.
bit 11 Unimplemented: Read as ‘0’
bit 10 AD12B: 10-bit or 12-bit Operation Mode bit
(1)
1 = 12-bit, 1-channel ADC operation
0 = 10-bit, 4-channel ADC operation
bit 9-8 FORM<1:0>: Data Output Format bits
For 10-bit operation:
11 = Signed fractional (DOUT = sddd dddd dd00 0000, where s = .NOT.d<9>)
10 = Fractional (D
OUT = dddd dddd dd00 0000)
01 = Signed integer (D
OUT = ssss sssd dddd dddd, where s = .NOT.d<9>)
00 = Integer (D
OUT = 0000 00dd dddd dddd)
For 12-bit operation:
11 = Signed fractional (DOUT = sddd dddd dddd 0000, where s = .NOT.d<11>)
10 = Fractional (D
OUT = dddd dddd dddd 0000)
01 = Signed Integer (D
OUT = ssss sddd dddd dddd, where s = .NOT.d<11>)
00 = Integer (D
OUT = 0000 dddd dddd dddd)
Note 1: This bit is only available in the ADC1 module. In the ADC2 module, this bit is unimplemented and is read
as ‘0’.
2: This setting is available in dsPIC33EPXXX(MC/MU)806/810/814 devices only.
3: Do not clear the DONE bit in software if ADC Sample Auto-Start is enabled (ASAM = 1).