Microchip Technology MA330011 Data Sheet
©
2007 Microchip Technology Inc.
Preliminary
DS70165E-page 279
dsPIC33F
REGISTER 22-1:
ADxCON1: ADCx CONTROL REGISTER 1 (where x = 1 or 2)
R/W-0
U-0
R/W-0
R/W-0
U-0
R/W-0
R/W-0
R/W-0
ADON
—
ADSIDL
ADDMABM
—
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
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 will provide 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 will provide 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 (D
OUT
=
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 (D
OUT
=
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
= Reserved
011
= MPWM interval ends sampling and starts conversion
010
= GP timer (Timer3 for ADC1, Timer5 for ADC2) compare ends sampling and starts conversion
001
= Active transition on INTx pin ends sampling and starts conversion
000
= Clearing sample bit ends sampling and starts conversion
bit 4
Unimplemented: Read as ‘
0
’