PIC24F04KA201 datasheet(148/224 Pages) MICROCHIP

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PIC24F04KA201 FAMILY

DS39937B-page 146

Preliminary

AD1CON2: A/D CONTROL REGISTER 2

R/W-0

U-0

R/W-0

U-0

VCFG2

VCFG1

VCFG0

OFFCAL(1)

—

CSCNA

—

bit 15

bit 8

R-0, HSC

U-0

R/W-0

BUFS

—

SMPI3

SMPI2

SMPI1

SMPI0

BUFM

ALTS

bit 7

bit 0

Legend:

U = Unimplemented bit, read as ‘0’

HSC = Hardware Settable/Clearable bit

R = Readable bit

W = Writable bit

r = Reserved bit’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is cleared

x = Bit is unknown

bit 15-13

VCFG<2:0>:

Voltage Reference Configuration bits

bit 12

OFFCAL:

Offset Calibration bit(1)

= Converts to get the offset calibration value

= Coverts to get the actual input value

bit 11

Unimplemented:

Read as ‘0’

bit 10

CSCNA:

Scan Input Selections for CH0+ S/H Input for MUX A Input Multiplexer Setting bit

= Scan inputs

= Do not scan inputs

bit 9-8

Unimplemented:

Read as ‘0’

bit 7

BUFS:

Buffer Fill Status bit (valid only when BUFM = 1)

= A/D is currently filling buffer, 08-0F, user should access data in 00-07

= A/D is currently filling buffer, 00-07, user should access data in 08-0F

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 16th sample/convert sequence

1110

= Interrupts at the completion of conversion for each 15th sample/convert sequence

0001

= Interrupts at the completion of conversion for each 2nd sample/convert sequence

0000

= Interrupts at the completion of conversion for each sample/convert sequence

bit 1

BUFM:

Buffer Mode Select bit

= Buffer configured as two 8-word buffers (ADC1BUFn<15:8> and ADC1BUFn<7:0>)

= Buffer configured as one 16-word buffer (ADC1BUFn<15:0>)

bit 0

ALTS:

Alternate Input Sample Mode Select bit

= Uses MUX A input multiplexer settings for first sample, then alternates between MUX B and

MUX A input multiplexer settings for all subsequent samples

= Always uses MUX A input multiplexer settings

Note 1:

When the OFFCAL bit is set, inputs are disconnected and tied to AVSS. This sets the inputs of the A/D to

zero. Then, the user can perform a conversion. Use of the Calibration mode is not affected by AD1PCFG

contents nor channel input selection. Any analog input switches are disconnected from the A/D converter

in this mode. The conversion result is stored by the user software and used to compensate subsequent

conversions. This can be done by adding the two’s complement of the result obtained with the OFFCAL bit

set to all normal A/D conversions.

VCFG<2:0>

VR+VR-

000

AVDD

AVSS

001

External VREF+ pin

AVSS

010

AVDD

External VREF- pin

011

External VREF+ pin

External VREF- pin

1xx

AVDD

AVSS

PIC24F04KA201 Datasheet(PDF) 148 Page - Microchip Technology

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