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PICDEM2 数据表(PDF) 18 Page - Microchip Technology |
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PICDEM2 数据表(HTML) 18 Page - Microchip Technology |
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18 / 60 page  2001 Microchip Technology Inc. DS30374D-page 13 A/D Demo 4.2 InitializeAD Routine The InitializeAD routine sets up the A/D converter for use with the PICDEM 2 board. The routine sets RA0, RA1, and RA4 as analog inputs, enables the A/D interrupt, sets the A/D to use the internal RC oscillator, selects channel 0, clears the A/D interrupt flag, enables peripheral interrupts and then enables global interrupts. Figure 4.3: Initialize A/D 4.3 SetupDelay Routine This subroutine delays for greater than one A/D converter clock period (2 to 6 µs when using the internal RC clock as this program does) to allow for sampling time. Figure 4.4: Setup Delay InitializeAD Set Ch0-Ch3 as analog inputs Select RC clock Select Ch0 as input Turn on A/D Enable Interrupts Return SetupDelay Initialize loop variable Decrement loop variable. Variable=0? Return No Yes |
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