Getac Technology Corporation V110GD Manuale Utente
© 2011 Microchip Technology Inc.
Preliminary
DS61168C-page 207
PIC32MX1XX/2XX
REGISTER 21-2:
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
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 15-13 VCFG<2:0>: Voltage Reference Configuration bits
V
REFH
V
REFL
000
AV
DD
AVss
001
External V
REF
+ pin
AV
SS
010
AV
DD
External V
REF
- pin
011
External V
REF
+ pin
External V
REF
- pin
1xx
AV
DD
AV
SS
bit 12
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 V
REFL
0
= Disable Offset Calibration mode
The inputs to the sample and hold amplifier 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
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, then alternates between Sample B and
Sample A input multiplexer settings for all subsequent samples
0
= Always use Sample A input multiplexer settings