Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

Register Log in

some problems of delay

Status
Not open for further replies.
A

andy40185

Member level 5
Joined
Sep 30, 2011
Messages
80
Helped
1
Reputation
2
Reaction score
1
Trophy points
1,288
Activity points
1,810
Hi all,

If I follow the below delay function, how many second of delay will be generate?
Is any method can easily to observe?
Assume the crystal frequency is 12MHz:

void delay(void)
{
int i;
for(i=0;i<500;i++);
}

Regards,
Andy
 

What is processor that you are using if it is 8051....generally 8051 takes 12 CLK per instruction ....So initernally running at 1 MHz seppd now ...if you do the calculation from 12MHz calculation it will be 500 * (1/1000000) sec. + 12CLK for function call instruction + 12CLK per assigment instruction....so closely arround 0.5 milisec...
 
This explanation does not include the actual code executed by the microcontroller, single instruction is assumed which is not likely. For testing the amount of delay actually produced, a LED can be connected to some port and changing the number controlling the loop can be varied and the effect observed. C libraries have standard delay function so the desired delay can directly be introduced without bothering about other details.
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top