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MPXM2202GS 数据表(PDF) 133 Page - Motorola, Inc |
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MPXM2202GS 数据表(HTML) 133 Page - Motorola, Inc |
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133 / 670 page  AN1635 2–97 Motorola Sensor Device Data www.motorola.com/semiconductors APPENDIX — ASSEMBLY CODE LISTING FOR BASEBALL PITCH SPEEDOMETER * Baseball Pitch Speedometer – Rev. 1.0 * * Program waits for detection of impact via the input capture pin and then reads four A/D channels. * The area under the Acceleration vs. Time curve is found by subtracting the steady state offsets * from the digitized readings and summing the results. The sum is then divided by an empirically * determined constant of proportionality, and the speed of the ball is displayed. * * Written by Carlos Miranda * Systems and Applications * Sensor Products Division * Motorola Semiconductor Products Sector * May 6, 1997 * * ******************************************************************************************************** * Although the information contained herein, as well as any information provided relative * * thereto, has been carefully reviewed and is believed accurate, Motorola assumes no * * liability arising out of its application or use, neither does it convey any license under * * its patent rights nor the rights of others. * ******************************************************************************************************** * These equates assign memory addresses to variables. EEPROM EQU $B600 CODEBGN EQU $B60D REGOFF EQU $1000 ;Offset to access registers beyond direct addressing range. PORTC EQU $03 PORTB EQU $04 DDRC EQU $07 TCTL2 EQU $21 TFLG1 EQU $23 ADCTL EQU $30 ADR1 EQU $31 ADR2 EQU $32 ADR3 EQU $33 ADR4 EQU $34 OPTION EQU $39 STACK EQU $01FF ;Starting address for the Stack Pointer. RAM EQU $0000 * These equates assign specific masks to variables to facilitate bit setting, clearing, etc. ADPU EQU $80 ;Power up the analog to digital converter circuitry. CSEL EQU $40 ;Select the internal system clock. CCF EQU $80 ;Conversion complete flag. IC1F EQU $04 ;Input Capture 1 flag. IC1FLE EQU $20 ;Configure Input Capture 1 to detect falling edges only. IC1FCLR EQU $FB ;Clear the Input Capture 1 flag. CHNLS47 EQU $14 ;Select channels 4 through 7 with MULT option ON. SAMPLES EQU $0200 ;Number of A/D samples taken. OC1F EQU $80 ;Output Compare 1 flag. OC1FCLR EQU $7F ;Clear the Output Compare flag. CURDLY EQU $0098 ;Timer cycles to create delay for displaying ”Your Speed.” RAMBYTS EQU $19 ;Number of RAM variables to clear during initialization. ALLONES EQU $FF YOURSPD EQU $01 PRPFCTR EQU $00AD ;This constant of proportionality was empirically determined. * Variables used for computation. ORG RAM OFFSET1 RMB 1 ;One for each accelerometer. OFFSET2 RMB 1 OFFSET3 RMB 1 OFFSET4 RMB 1 SUM1 RMB 2 ;Area under the acceleration vs. time curve. SUM2 RMB 2 SUM3 RMB 2 SUM4 RMB 2 GRNDSUM RMB 2 COUNT RMB 2 CURBIN RMB 1 TEMPBIN RMB 1 BCD RMB 2 CURDSPL RMB 2 MAXBIN RMB 1 MAXDSPL RMB 2 * LED seven segment display patterns table. ORG EEPROM JMP START SEVSEG FCB %11111010 FCB %01100000 FCB %11011100 FCB %11110100 FCB %01100110 FCB %10110110 FCB %10111110 FCB %11100000 FCB %11111110 FCB %11100110 Freescale Semiconductor, Inc. For More Information On This Product, Go to: www.freescale.com |
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