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PIC24F16KA102 Datasheet(PDF) 174 Page - Microchip Technology |
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PIC24F16KA102 Datasheet(HTML) 174 Page - Microchip Technology |
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174 / 254 page  PIC24F16KA102 FAMILY DS39927B-page 172 Preliminary © 2009 Microchip Technology Inc. REGISTER 22-2: AD1CON2: A/D CONTROL REGISTER 2 R/W-0 R/W-0 R/W-0 R/W-0 U-0 R/W-0 U-0 U-0 VCFG2 VCFG1 VCFG0 OFFCAL(1) — CSCNA — — bit 15 bit 8 R-0, HSC 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: HSC = Hardware Settable/Clearable 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 15-13 VCFG<2:0>: Voltage Reference Configuration bits bit 12 OFFCAL: Offset Calibration bit(1) 1 = Converts to get the offset calibration value 0 = Converts 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 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 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 |
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