Datasheet

 2009-2013 Microchip Technology Inc. DS60001156H-page 251
PIC32MX5XX/6XX/7XX
REGISTER 22-2: AD1CON2: ADC CONTROL REGISTER 2
Bit
Range
Bit
31/23/15/7
Bit
30/22/14/6
Bit
29/21/13/5
Bit
28/20/12/4
Bit
27/19/11/3
Bit
26/18/10/2
Bit
25/17/9/1
Bit
24/16/8/0
31:24
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
23:16
U-0 U-0 U-0 U-0 U-0 U-0 U-0 U-0
— — — — — — — —
15:8
R/W-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 U-0 U-0
VCFG<2:0> OFFCAL —CSCNA— —
7:0
R-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
BUFS — SMPI<3:0> BUFM ALTS
Legend:
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 31-16 Unimplemented: Read as ‘0’
bit 15-13 VCFG<2:0>: Voltage Reference Configuration bits
Bit Value V
REFH VREFL
1xx AVDD AVss
011
External V
REF+ pin External VREF- pin
010
AV
DD External VREF- pin
001
External VREF+ pin AVSS
000 AVDD AVss
bit 12 OFFCAL: Input Offset Calibration Mode Select bit
1 = Enable Offset Calibration mode
Positive and negative inputs of the S&H circuit are connected to V
REFL.
0 = Disable Offset Calibration mode
The inputs to the S&H circuit are controlled by AD1CHS or AD1CSSL.
bit 11 Unimplemented: Read as ‘0’
bit 10 CSCNA: Input Scan Select bit
1 = Scan inputs
0 = Do not scan inputs
bit 9-8 Unimplemented: Read as ‘0’
bit 7 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
bit 6 Unimplemented: Read as ‘0’
bit 5-2 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
bit 1 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
bit 0 ALTS: Alternate Input Sample Mode Select bit
1 = Uses Sample A input multiplexer settings for first sample, and then alternates between Sample B and
Sample A input multiplexer settings for all subsequent samples
0 = Always use Sample A input multiplexer settings