Pulse width measurement

[sivamit]

Hi friends,
Can anyone tell me -How to measure the pulse width (in the range of micro seconds) of a pulse? Amplitude level is around 2 volts. And the pulse repetition frequency is 200.
Pls.

 

[IanP]

Check out this method:
"Pulse-Width Measurement with a Counter"
http://zone.ni.com/devzone/conceptd.nsf/webmain/7C77FB9EDC17C3C386256802007B8AB3

Regards,
IanP

 

[hami007]

u can do it by using int0 or int1 and gate in the timer mode of 8051 use that condition

MOV TMOD,#00001001B


MOV TH0,#0
MOV TL0,#0

SETB TR0

JNB P3.2,$
JB P3.2,$


MOV R2,TH0
MOV R3,TL0



MOV A,#0FFH
SUBB A,R3
MOV R4,A

MOV A,#0FFH
SUBB A,R2
MOV R5,A

MOV TMOD,#10H
MOV TH1,R5
MOV TL1,R4

SETB P2.2
SETB TR1

JNB TF1,$
CLR P2.2

CALL DELAY

CLR TR1
CLR TF1