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PICDEM2 数据表(PDF) 19 Page - Microchip Technology |
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PICDEM2 数据表(HTML) 19 Page - Microchip Technology |
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19 / 60 page  PICDEM 2 User’s Guide DS30374D-page 14 2001 Microchip Technology Inc. 4.4 Service_Int Routine This subroutine handles the A/D converter interrupt and updating of the LEDs on PORTB. The first thing the routine does is to check if the A/D interrupt flag is set. If it is not, the interrupt was caused by some other peripheral, and the program returns to the main routine with interrupts re-enabled. If the interrupt was caused by the A/D converter, the A/D result register is read, and the value put on the LEDs. The A/D interrupt flag is then reset, and the peripheral interrupts are enabled. The routine then waits for the sample time (2*TAD), starts the next conversion, and returns with global interrupts enabled. Figure 4.5: Service Interrupt Service_int Interrupt Service Routine (SetupDelay) A/D caused interrupt? Get A/D Value Display on LEDs No Yes Reset A/D Flag Re-enable Periph Ints Delay for 2*Tad Start A/D Conversion Return (SetupDelay) |
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