Hi people

got a question here hope you can help me out..

I am trying to measure a pulse train of 50 KHZ at 50% duty cycle without the icap funtion from the chip.

Is the following code capable? and to what extend??

language suite : microchip

prescaler <1:1>

TMR0 is program cycle triggered

edge2- edge1=period

LOOP1 BTFSC PORTD,0 ;to ensure that the
GOTO LOOP1 ;high state is capture

LOOP2     BTFSS     PORTD,0    ;after an edge
          GOTO      LOOP2
          MOVF      TMR0,W
          MOVWF     EDGE1
LOOP3     BTFSC     PORTD,0
          GOTO      LOOP3
          MOVF      TMR0,W
          MOVWF     EDGE2

If i am not wrong error max 4 cycles

2 at loop2 (at worse case)

2 at loop3 (at worse case)

Therefore the min period that can capture is

period = 10 cycles assuming 50% duty cycle

Any if any one have any better way of doing

this task please kindly mail it to me.

I am still very new to this .THANKS

regards

PSL