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MPXM2102AS Datasheet(PDF) 519 Page - Motorola, Inc |
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MPXM2102AS Datasheet(HTML) 519 Page - Motorola, Inc |
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519 / 670 page  AN1586 3–373 Motorola Sensor Device Data www.motorola.com/semiconductors * GENERATES THE PULSE TRAIN ON TCMP GEN LDA PERIODL * LOW BYTE OF THE PERIOD SUB HIGHTIMEL * LOW BYTE OF THE HIGHTIME STA LOWTIMEL * LOW BYTE OF THE LOWTIME LDA PERIODH * HIGH BYTE OF THE PERIOD SBC HIGHTIMEH * HIGH BYTE OF THE HIGHTIME STA LOWTIMEH * HIGH BYTE OF THE LOWTIME RTS * INCREASE THE HIGH TIME (DUTY CYCLE) OF THE PULSE TRAIN INCPW LDA HIGHTIMEL ADD #$01 * INCREMENT PULSE WIDTH BY 2 µs STA HIGHTIMEL LDA HIGHTIMEH ADC #$0 STA HIGHTIMEH RTS * DECREASE THE HIGH TIME (DUTY CYCLE) OF THE PULSE TRAIN DECPW LDA HIGHTIMEL SUB #$01 * DECREMENT PULSE WIDTH BY 2 µs STA HIGHTIMEL LDA HIGHTIMEH SBC #$0 STA HIGHTIMEH JSR GEN RTS * INCREASE THE PERIOD (DECREASE FREQUENCY) OF THE PULSE TRAIN INCPER LDA PERIODL ADD #$05 * INCREMENT PERIOD BY 10 µs STA PERIODL LDA PERIODH ADC #$0 * ADJUST HIGH BYTE OF PERIOD IF CARRY STA PERIODH JSR GEN RTS * DECREASE THE PERIOD (INCREASE FREQUENCY) OF THE PULSE TRAIN DECPER LDA PERIODL SUB #$05 * DECREMENT PERIOD BY 10 µs STA PERIODL LDA PERIODH SBC #$0 * ADJUST HIGH BYTE OF PERIOD IF BORROW STA PERIODH JSR GEN RTS TIMER * INTERRUPT SERVICE ROUTINE FOR TCMP LDA TSR * CLEAR OCF FLAG IN TSR LDA TCMPL BRSET 0,TCR,ADDHIGH * HIGH OR LOW PULSE TIME NEEDED? ADDLOW BSET 0,TCR * ADD LOW TIME TO THE PULSE TRAIN LDA LOWTIMEL ADD TCMPL TAX LDA TCMPH ADC LOWTIMEH STA TCMPH STX TCMPL RTI ADDHIGH BCLR 0,TCR * ADD HIGH TIME TO THE PULSE TRAIN LDA HIGHTIMEL ADD TCMPL TAX LDA TCMPH ADC HIGHTIMEH STA TCMPH STX TCMPL RTI Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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