frequency and duty cycle??

Forum 2005-2010 (read only) Software Syntax & Programs
1

what is and how do i obtain the frequency and duty cycle of the sqaure wave generated by the following code?

MOV TMOD,#2H
MOV TH0,#-250
AGAIN: SETB P1.4
ACALL DELAY
CLR P1.4
ACALL DELAY
SJMP AGAIN
DELAY: SETB TR0
BACK: JNB TF0,BACK
CLR TR0
CLR TF0

2

check this out http://tscm.com/dutycy.pdf sorry i cant help more

3

Easiest way is to look at it with an oscilloscope
www.dpscope.com

4

what is and how do i obtain the frequency and duty cycle of the sqaure wave generated by the following code?

Without knowing the clock speed, impossible to say.
Maybe ask in an 8051 forum? :wink:

[edit]FWIW, my guess* is that the duty cycle is 50%

*Caveat: I haven't used an 8051 in the last quarter century
[/edit]