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PIC12F683 Datasheet(PDF) 59 Page - Microchip Technology |
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PIC12F683 Datasheet(HTML) 59 Page - Microchip Technology |
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59 / 148 page  2004 Microchip Technology Inc. Preliminary DS41211B-page 57 PIC12F683 9.1.5 STARTING A CONVERSION The A/D conversion is initiated by setting the GO/DONE bit (ADCON0<1>). When the conversion is complete, the A/D module: • Clears the GO/DONE bit • Sets the ADIF flag (PIR1<6>) • Generates an interrupt (if enabled) If the conversion must be aborted, the GO/DONE bit can be cleared in software. The ADRESH:ADRESL registers will not be updated with the partially complete A/D conversion sample. Instead, the ADRESH:ADRESL registers will retain the value of the previous conversion. After an aborted conversion, a 2TAD delay is required before another acquisition can be initiated. Following the delay, an input acquisition is automatically started on the selected channel. FIGURE 9-2: A/D CONVERSION TAD CYCLES 9.1.6 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 9-3 shows the output formats. FIGURE 9-3: 10-BIT A/D RESULT FORMAT Note: The GO/DONE bit should not be set in the same instruction that turns on the A/D. 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 |
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