![](http://datasheet.mmic.net.cn/280000/MPX2202GVP_datasheet_16098581/MPX2202GVP_402.png)
3–256
Motorola Sensor Device Data
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099A BB 56 ADD $56
099C B7 58 STA $58
099E B6 57 LDA $57
09A0 B9 55 ADC $55
09A2 B7 57 STA $57
09A4 B7 55 STA $55
09A6 B6 58 LDA $58
09A8 B7 56 STA $56
}
09AA 3C 5B INC $5B
09AC 20 D7 BRA $0985
09AE B6 56 LDA $56 atodtemp = atodtemp/100;
09B0 B7 58 STA $58
09B2 B6 55 LDA $55
09B4 B7 57 STA $57
09B6 3F 9A CLR $9A
09B8 A6 64 LDA #$64
09BA B7 9B STA $9B
09BC CD 0B F1 JSR $0BF1
09BF CD 0C 22 JSR $0C22
09C2 BF 55 STX $55
09C4 B7 56 STA $56
09C6 81 RTS return atodtemp;
}
/***************************************************************************/
void fixcompare (void) /* sets–up the timer compare for the next interrupt */
{
09C7 B6 18 LDA $18 q.b.hi =tcnthi;
09C9 B7 66 STA $66
09CB B6 19 LDA $19 q.b.lo = tcntlo;
09CD B7 67 STA $67
09CF AB 4C ADD #$4C q.l +=7500; /* ((4mhz xtal/2)/4) = counter period = 2us.*7500 = 15ms. */
09D1 B7 67 STA $67
09D3 B6 66 LDA $66
09D5 A9 1D ADC #$1D
09D7 B7 66 STA $66
09D9 B7 16 STA $16 ocmphi1 = q.b.hi;
09DB B6 13 LDA $13 areg=tsr; /* dummy read */
09DD B6 67 LDA $67 ocmplo1 = q.b.lo;
09DF B7 17 STA $17
09E1 81 RTS }
/***************************************************************************/
void TIMERCMP (void) /* timer service module */
1FF6 09 E2 {
09E2 33 02 COM $02 portc =~ portc; /* service the lcd by inverting the ports */
09E4 33 01 COM $01 portb =~ portb;
09E6 33 00 COM $00 porta =~ porta;
09E8 AD DD BSR $09C7 fixcompare();
09EA 80 RTI }
/***************************************************************************/
void adzero(void) /* called by initio() to save initial xdcr’s zero
pressure offset voltage output */
{
09EB 3F 64 CLR $64 for ( j=0; j<20; ++j) /* give the sensor time to ”warm–up” and the
09ED 3F 63 CLR $63
09EF B6 64 LDA $64
09F1 A0 14 SUB #$14
09F3 B6 63 LDA $63
09F5 A2 00 SBC #$00
09F7 24 0B BCC $0A04
power supply time to settle down */
{
09F9 CD 09 68 JSR $0968 delay();
}
09FC 3C 64 INC $64
09FE 26 02 BNE $0A02
0A00 3C 63 INC $63
0A02 20 EB BRA $09EF
0A04 CD 09 7F JSR $097F xdcr_offset = read_a2d();
F
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