Datasheet

PIC24FJ256GB110 FAMILY
DS39897C-page 270  2009 Microchip Technology Inc.
REGISTER 22-2: AD1CON2: A/D CONTROL REGISTER 2
R/W-0 R/W-0 R/W-0 r-0 U-0 R/W-0 U-0 U-0
VCFG2 VCFG1 VCFG0 r — CSCNA — —
bit 15 bit 8
R-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
BUFS
— SMPI3 SMPI2 SMPI1 SMPI0 BUFM ALTS
bit 7 bit 0
Legend: U = Unimplemented bit, read as ‘0’
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 Reserved: Maintain as ‘0’
bit 11 Unimplemented: Read as ‘0’
bit 10 CSCNA: Scan Input Selections for CH0+ S/H Input for MUX A Input Multiplexer Setting bit
1 = Scan inputs
0 = Do not scan inputs
bit 9-8 Unimplemented: Read as ‘0’
bit 7 BUFS: Buffer Fill Status bit (valid only when BUFM = 1)
1 = A/D is currently filling buffer, 08-0F, user should access data in 00-07
0 = 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
1 = Buffer configured as two 8-word buffers (ADC1BUFn<15:8> and ADC1BUFn<7:0>)
0 = Buffer configured as one 16-word buffer (ADC1BUFn<15:0>)
bit 0 ALTS: Alternate Input Sample Mode Select bit
1 = Uses MUX A input multiplexer settings for first sample, then alternates between MUX B and
MUX A input multiplexer settings for all subsequent samples
0 = Always uses MUX A input multiplexer settings
VCFG<2:0> VR+VR-
000 AV
DD AVSS
001 External VREF+ pin AVSS
010 AVDD External VREF- pin
011 External VREF+ pin External VREF- pin
1xx AVDD AVSS