AN1602 datasheet(7/21 Pages) STMICROELECTRONICS

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16-BIT TIMING OPERATIONS USING ST7262 OR ST7263B MCUs

1.1.3.2 Example of input capture interrupt routine

.Inp_Cap_Routine

;

Ld A , ARTICR1

;

Ld CurrentICAP , A

;

;------------------------------------------;

Ld A, ARTICCSR

;

;------------------------------------------;

Ld A , TBUCV

;Load the TBU counter value

Ld TmpTBU1 , A

;into TmpTBU1

Ld A , ARTCAR

;Load the ART counter Value

Ld TmpART1 , A

;into TmpART1

Ld A , TBUCV

;Load the TBU counter value into

Ld TmpTBU2 , A

;

;------------------------------------------;

Btjf FirstEdge,#0,FirstRisingEdge

;TmpTBU2

;------------------------------------------;

;.SecondRisingEdge

;

Ld A , TmpART1

;Compare ART & ICR

Cp A , CurrentICAP

;If ART > ICR then Case 2

jrpl Case2

;

Ld A , TmpTBU2

;Case 1 : TBU = TBU2 - 1

Dec A

;

jra Next2

;

.Case2

Ld A , TmpTBU1

;Case TBU = TBU1

.Next2

Ld PeriodEndHR , A

;load TBUCV into PeriodEndHR

Ld A , CurrentICAP

;Load The ART Inp Capt 1 register

Ld PeriodEndLR , A

;Value into PeriodEndLR

Clr FirstEdge

;

Iret

;

.FirstRisingEdge

;

Ld A , TmpART1

;Compare ART & ICR

Cp A , CurrentICAP

;

jrpl Case1

;

Ld A , TmpTBU2

;Case : TBU = TBU2 - 1

Dec A

;

jra Next1

;

.Case1

Ld A , TmpTBU1

; Case TBU = TBU1

.Next1

Ld PeriodStartHR , A

;load TBUCV into PulseEndHR

Ld A , CurrentICAP

;Load The ART Inp Capt 1 register

Ld PeriodStartLR , A

;Value into PulseEndLR

Inc FirstEdge

;

Iret

;

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