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PIC12F1822-I/MF 数据表(PDF) 136 Page - Microchip Technology |
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PIC12F1822-I/MF 数据表(HTML) 136 Page - Microchip Technology |
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136 / 398 page  PIC12F/LF1822/16F/LF1823 DS41413A-page 136 Preliminary 2010 Microchip Technology Inc. 15.1.5 INTERRUPTS The ADC module allows for the ability to generate an interrupt upon completion of an Analog-to-Digital conversion. The ADC Interrupt Flag is the ADIF bit in the PIR1 register. The ADC Interrupt Enable is the ADIE bit in the PIE1 register. The ADIF bit must be cleared in software. This interrupt can be generated while the device is operating or while in Sleep. If the device is in Sleep, the interrupt will wake-up the device. Upon waking from Sleep, the next instruction following the SLEEP instruc- tion is always executed. If the user is attempting to wake-up from Sleep and resume in-line code execu- tion, the GIE and PEIE bits of the INTCON register must be disabled. If the GIE and PEIE bits of the INTCON register are enabled, execution will switch to the Interrupt Service Routine. Please refer to Section 8.0 “Interrupts” for more information. 15.1.6 RESULT FORMATTING The 10-bit A/D conversion result can be supplied in two formats, left justified or right justified. The ADFM bit of the ADCON1 register controls the output format. Figure 15-3 shows the two output formats. FIGURE 15-3: 10-BIT A/D CONVERSION RESULT FORMAT Note 1: The ADIF bit is set at the completion of every conversion, regardless of whether or not the ADC interrupt is enabled. 2: The ADC operates during Sleep only when the FRC oscillator is selected. ADRESH ADRESL (ADFM = 0)MSB LSB bit 7 bit 0 bit 7 bit 0 10-bit A/D Result Unimplemented: Read as ‘0’ (ADFM = 1) MSB LSB bit 7 bit 0 bit 7 bit 0 Unimplemented: Read as ‘0’ 10-bit A/D Result |
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