[SOLVED] Timer calculation for 89s52

[cyanpraveen]

Hello friends
need an help. i am new to micro controller stuffs.

I need to generate a pulse of total 20ms with 2ms on time and 18ms off time using 89s52 with crystal frequency of 11.059MHz and 12 clk cycle using timer zero to run 3 pin dc servo motor

Now how can i calculate TH0 and TL0. is der any other parameter i need to calculate

it might be silly q's to guys like u, but dont regret to ans .

Thousands of tks in adv guys

 

[bassa]

You may find the theory here **broken link removed**

To calculate required value here 8051 Microcontroller Peripheral Timing Calculator

 

[#MAAM#]

this is useful pdf for timers in 8051. download from here

 

[cyanpraveen]

thanks . i had finished the time calculation and i m getting exact pulse in logic analyzer, but wen comes to the hardware part i m not getting any pulse.

I am using 89s52 development board( AT89S52 Development Board : rhydoLABZ India , Your Source for Robotics & Embedded System ).

After flashing program i had checked through CRO.. at the pin de voltage is gettin varied but no pluse or square wave is coming...

Any idea pals...

 

[#MAAM#]

please upload your schematic to check it