delay program

[Peter Nabil]

hi every one
i have a 89c51 microcontroller and i need to make a program to make a delay for 1ms would u help me plz

 

[Josephselim]

Dear Peter

in order to calculate the time delay you have to tell us what is the speed of your crystal oscillator that you use

 

[Jay.slovak]

For 8051's you should asume 12 clocks per instruction. So If you have 51 running @ 12Mhz, it gives you 1us per instruction. Just make a program that will have 1000 instructions to make 1ms delay. Use DJNZ and JMP instructions...

 

[bmcculla]

Just use a timer - this sort of stuff is why they're put into microcontrollers.

 

[Peter Nabil]

Hi Josephselim,Jay.slovak( nice photo by the way )and bmcculla

thanks for your support but i managed to do a one second delay using NOP instructions thank u again bye

 

[Jay.slovak]

BTW, How many NOPs did you use? Because 1s = 1000000 NOPs ! Or have you used a cycle....? Just curious.