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Motor de Búsqueda de Datasheet de Componentes Electrónicos |
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MPXM2102AS Datasheet(PDF) 134 Page - Motorola, Inc |
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MPXM2102AS Datasheet(HTML) 134 Page - Motorola, Inc |
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134 / 670 page  AN1635 2–98 Motorola Sensor Device Data www.motorola.com/semiconductors * This is the main program loop. ORG CODEBGN START LDS #STACK LDX #REGOFF JSR LEDINIT JSR ADCINIT JSR VARINIT MAIN JSR CAPTURE JSR COMPUTE JSR BINTBCD JSR OUTPUT BRA MAIN * This subroutine initializes ports B & C, and the LED display. LEDINIT PSHX PSHA LDX #REGOFF BSET DDRC,X,ALLONES ;Configure port C as an output. LDAA SEVSEG STAA PORTB,X STAA PORTC,X PULA PULX RTS * This subroutine initializes the analog to digital converter. ADCINIT PSHX PSHA LDX #REGOFF BSET OPTION,X,ADPU ;Turn on A/D converter via ADPU bit. BCLR OPTION,X,CSEL ;Select system e clock via CSEL bit. CLRA DELAY INCA BNE DELAY PULA PULX RTS * This subroutine clears all the memory variables. VARINIT PSHX LDX #$0000 CLRVAR CLR OFFSET1,X INX CPX #RAMBYTS ;Number of RMB bytes. BLO CLRVAR DONECLR LDX #REGOFF LDAA #CHNLS47 ;Measure the offset. STAA ADCTL,X OFSWAIT BRCLR ADCTL,X,CCF,OFSWAIT LDD ADR1,X STD OFFSET1 LDD ADR3,X STD OFFSET3 PULX RTS * This subroutine waits for impact and computes the area under the curve. CAPTURE PSHX PSHA PSHB LDX #REGOFF BSET TCTL2,X,IC1FLE ;Set IC1 to detect falling edge only. BCLR TFLG1,X,IC1FCLR MONITOR BRCLR TFLG1,X,IC1F,MONITOR ADCREAD LDAA #CHNLS47 ;Select channels 4 – 7 for conversion. STAA ADCTL,X ADCWAIT BRCLR ADCTL,X,CCF,ADCWAIT CALDLT1 LDAB ADR1,X SUBB OFFSET1 BPL ADDSUM1 COMB INCB ADDSUM1 CLRA ADDD SUM1 STD SUM1 CALDLT2 LDAB ADR2,X SUBB OFFSET2 BPL ADDSUM2 COMB INCB ADDSUM2 CLRA ADDD SUM2 STD SUM2 CALDLT3 LDAB ADR3,X SUBB OFFSET3 BPL ADDSUM3 COMB INCB Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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