AN1602 datasheet(10/21 Pages) STMICROELECTRONICS

Part #	AN1602

Description	16-BIT TIMING OPERATIONS USING ST7262 OR ST7263B MCUs

PDF	21 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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16-BIT TIMING OPERATIONS USING ST7262 OR ST7263B MCUs

Figure 10. Input Capture Sequence

1.2.3.2 Example of input capture interrupt routine

.Input_Capt_Rt

Ld A , TIC1HR

; Lock The TICR

Btjf FirstEdge ,#0, FirstRisingEdge

; Test First Or Second Edge

.SecondRisingEdge

;

Ld PeriodEndHR , A; Load PriodEnd Values

Ld A , TIC1LR

;

Ld PeriodEndLR , A;

Ld A , TSR

;Clear ICAP interrupt Flag

Ld A , TIC1LR

;

Clr FirstEdge

;

Iret

;

.FirstRisingEdge

;

Ld PeriodStartHR , A

; Load PriodStart Values

Ld A , TIC1LR

;

Ld PeriodStartLR , A

;

Ld A , TSR

;Clear ICAP interrupt Flag

Ld A , TIC1LR

;

Inc FirstEdge

;

Iret

;

Input capture interrupt

YES

- Configure Time clock frequency

- Select sensitive edge on ICAP pin

- FirstEdge = 0

- Store the IC1HR Value in PeriodStartHR

- Store the IC1LR Value in PeriodStartLR

- Increment FirstEdge

- Store the ICP2HR Value in PeriodEndHR

- Store the ICP2LR Value in PeriodEndLR

-Decrement FirstEdge

First Edge =?

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