PIC32MX1XX Datasheet, PDF (207/320 Pages) Microchip Technology – 32-bit Microcontrollers (up to 128 KB Flash and 32 KB SRAM) with Audio and Graphics Interfaces, USB, and Advanced Analog

PIC32MX1XX/2XX
REGISTER 21-2: AD1CON2: ADC CONTROL REGISTER 2
Bit
Bit
Bit
Bit
Bit
Bit
Range 31/23/15/7 30/22/14/6 29/21/13/5 28/20/12/4 27/19/11/3
31:24
23:16
15:8
7:0
U-0
—
U-0
—
R/W-0
R-0
BUFS
U-0
—
U-0
—
R/W-0
VCFG<2:0>
U-0
—
U-0
—
U-0
—
R/W-0
R/W-0
U-0
U-0
—
—
U-0
U-0
—
—
R/W-0
U-0
OFFCAL
—
R/W-0
R/W-0
SMPI<3:0>
Bit
26/18/10/2
U-0
—
U-0
—
R/W-0
CSCNA
R/W-0
Bit
25/17/9/1
U-0
—
U-0
—
U-0
—
R/W-0
BUFM
Bit
24/16/8/0
U-0
—
U-0
—
U-0
—
R/W-0
ALTS
Legend:
R = Readable bit
-n = Value at POR
W = Writable bit
‘1’ = Bit is set
U = Unimplemented bit, read as ‘0’
‘0’ = Bit is cleared
x = Bit is unknown
bit 31-16 Unimplemented: Read as ‘0’
bit 15-13 VCFG<2:0>: Voltage Reference Configuration bits
VREFH
VREFL
000
AVDD
AVss
001
External VREF+ pin
AVSS
010
AVDD
External VREF- pin
011
External VREF+ pin
External VREF- pin
1xx
AVDD
AVSS
bit 12
bit 11
bit 10
bit 9-8
bit 7
bit 6
bit 5-2
bit 1
bit 0
OFFCAL: Input Offset Calibration Mode Select bit
1 = Enable Offset Calibration mode
Positive and negative inputs of the sample and hold amplifier are connected to VREFL
0 = Disable Offset Calibration mode
The inputs to the sample and hold amplifier are controlled by AD1CHS or AD1CSSL
Unimplemented: Read as ‘0’
CSCNA: Input Scan Select bit
1 = Scan inputs
0 = Do not scan inputs
Unimplemented: Read as ‘0’
BUFS: Buffer Fill Status bit
Only valid when BUFM = 1.
1 = ADC is currently filling buffer 0x8-0xF, user should access data in 0x0-0x7
0 = ADC is currently filling buffer 0x0-0x7, user should access data in 0x8-0xF
Unimplemented: Read as ‘0’
SMPI<3:0>: Sample/Convert Sequences Per Interrupt Selection bits
1111 = Interrupts at the completion of conversion for each 16^th sample/convert sequence
1110 = Interrupts at the completion of conversion for each 15^th sample/convert sequence
•
•
•
0001 = Interrupts at the completion of conversion for each 2^nd sample/convert sequence
0000 = Interrupts at the completion of conversion for each sample/convert sequence
BUFM: ADC Result Buffer Mode Select bit
1 = Buffer configured as two 8-word buffers, ADC1BUF7-ADC1BUF0, ADC1BUFF-ADCBUF8
0 = Buffer configured as one 16-word buffer ADC1BUFF-ADC1BUF0
ALTS: Alternate Input Sample Mode Select bit
1 = Uses Sample A input multiplexer settings for first sample, then alternates between Sample B and
Sample A input multiplexer settings for all subsequent samples
0 = Always use Sample A input multiplexer settings
© 2011-2012 Microchip Technology Inc.
Preliminary
DS61168D-page 207