Datasheet

PIC24FJ16MC101/102 AND PIC24FJ32MC101/102/104
DS39997C-page 196 Preliminary © 2011-2012 Microchip Technology Inc.
REGISTER 19-1: AD1CON1: ADC1 CONTROL REGISTER 1
R/W-0 U-0 R/W-0 U-0 U-0 U-0 R/W-0 R/W-0
ADON —ADSIDL— — — 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 = Clearable 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 12-10 Unimplemented: Read as ‘0’
bit 9-8 FORM<1:0>: Data Output Format bits
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 (DOUT = ssss sssd dddd dddd, where s = .NOT.d<9>)
00 = Integer (D
OUT = 0000 00dd dddd dddd)
bit 7-5 SSRC<2:0>: Sample Clock Source Select bits
111 = Internal counter ends sampling and starts conversion (auto-convert)
110 = CTMU
101 = Reserved
100 = Reserved
011 = Motor Control PWM interval ends sampling and starts conversion
010 = GP timer 3 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’
bit 3 SIMSAM: Simultaneous Sample Select bit (applicable only when CHPS<1:0> = 01 or 1x)
1 = Samples CH0, CH1, CH2, CH3 simultaneously (when CHPS<1:0> = 1x); or
Samples CH0 and CH1 simultaneously (when CHPS<1:0> = 01)
0 = Samples multiple channels individually in sequence
bit 2 ASAM: ADC Sample Auto-Start bit
1 = Sampling begins immediately after last conversion. SAMP bit is auto-set.
0 = Sampling begins when SAMP bit is set
bit 1 SAMP: ADC Sample Enable bit
1 = ADC sample-and-hold amplifiers are sampling
0 = ADC sample-and-hold amplifiers are holding
If ASAM = 0, software can write ‘1’ to begin sampling. Automatically set by hardware if ASAM = 1.
If SSRC = 000, software can write ‘0’ to end sampling and start conversion. If SSRC ≠ 000,
automatically cleared by hardware to end sampling and start conversion.