delay program - Electronic Circuits Projects Diagrams Free

Peter Nabil · 12th February 2005, 08:23 PM

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

ops:

Josephselim · 13th February 2005, 10:37 AM

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** · 13th February 2005, 11:07 AM

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 · 14th February 2005, 02:01 AM

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

Peter Nabil · 14th February 2005, 05:35 PM

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** · 14th February 2005, 06:55 PM

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

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12th February 2005, 08:23 PM	(permalink)
Peter Nabil	delay program 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 ops:

13th February 2005, 10:37 AM	(permalink)
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

13th February 2005, 11:07 AM	(permalink)
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... __________________ "I share, thus I am" Jay.slovak Read this! ICD2 Clone Best PIC/DsPIC Bootloader Read my Inchworm ICD2 review!

14th February 2005, 02:01 AM	(permalink)
bmcculla	Just use a timer - this sort of stuff is why they're put into microcontrollers.

14th February 2005, 05:35 PM	(permalink)
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

14th February 2005, 06:55 PM	(permalink)
Jay.slovak	BTW, How many NOPs did you use? Because 1s = 1000000 NOPs ! Or have you used a cycle....? Just curious. __________________ "I share, thus I am" Jay.slovak Read this! ICD2 Clone Best PIC/DsPIC Bootloader Read my Inchworm ICD2 review!