Datasheet

dsPIC33FJ32GP302/304, dsPIC33FJ64GPX02/X04, AND dsPIC33FJ128GPX02/X04
DS70292G-page 268 © 2007-2012 Microchip Technology Inc.
21.6 ADC Control Registers
REGISTER 21-1: AD1CON1: ADC1 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 FORM<1:0>
bit 15 bit 8
R/W-0 R/W-0 R/W-0 U-0 R/W-0 R/W-0 R/W-0
HC,HS
R/C-0
HC, HS
SSRC<2:0>
— SIMSAM ASAM SAMP DONE
bit 7 bit 0
Legend: HC = Cleared by hardware HS = Set by hardware C = Clear only 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 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 = 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 (DOUT = 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)
bit 7-5 SSRC<2:0>: Sample Clock Source Select bits
111 = Internal counter ends sampling and starts conversion (auto-convert)
110 = Reserved
101 = Reserved
100 = GP timer (Timer5 for ADC1) compare ends sampling and starts conversion
011 = Reserved
010 = GP timer (Timer3 for ADC1) compare ends sampling and starts conversion
001 = Active transition on INT0 pin ends sampling and starts conversion
000 = Clearing sample bit ends sampling and starts conversion
bit 4 Unimplemented: Read as ‘0’