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PIC16F688-E/ST Datasheet(PDF) 67 Page - Microchip Technology |
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PIC16F688-E/ST Datasheet(HTML) 67 Page - Microchip Technology |
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67 / 174 page  2004 Microchip Technology Inc. Preliminary DS41203B-page 65 PIC16F688 FIGURE 8-2: A/D CONVERSION TAD CYCLES 8.1.6 CONVERSION OUTPUT The A/D conversion can be supplied in two formats: left or right shifted. The ADFM bit (ADCON0<7>) controls the output format. Figure 8-3 shows the output formats. FIGURE 8-3: 10-BIT A/D RESULT FORMAT REGISTER 8-1: ANSEL – ANALOG SELECT REGISTER (ADDRESS: 91h) TAD1 TAD2 TAD3 TAD4 TAD5 TAD6 TAD7 TAD8 TAD9 Set GO bit Holding Capacitor is Disconnected from Analog Input (typically 100 ns) b9 b8 b7 b6 b5 b4 b3 b2 TAD10 TAD11 b1 b0 TCY to TAD Conversion Starts ADRESH and ADRESL registers are Loaded, GO bit is Cleared, ADIF bit is Set, Holding Capacitor is Connected to Analog Input ADRESH ADRESL (ADFM = 0) MSB LSB bit 7bit 0 bit 7bit 0 10-bit A/D Result Unimplemented: Read as ‘0’ (ADFM = 1) MSB LSB bit 7bit 0 bit 7bit 0 Unimplemented: Read as ‘0’ 10-bit A/D Result R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 R/W-1 ANS7 ANS6 ANS5 ANS4 ANS3 ANS2 ANS1 ANS0 bit 7 bit 0 bit 7-0: ANS<7:0>: Analog Select bits Analog select between analog or digital function on pins AN<7:0>, respectively. 1 = Analog input. Pin is assigned as analog input.(1) 0 = Digital I/O. Pin is assigned to port or special function. Note 1: Setting a pin to an analog input automatically disables the digital input circuitry, weak pull-ups, and interrupt-on-change if available. The corresponding TRIS bit must be set to Input mode in order to allow external control of the voltage on the pin. 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 |
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