Discussion in "8051 Discussion Forum" started by    SAMEET    Aug 29, 2009.
Sat Aug 29 2009, 02:48 PM
#1
i require code for 5 sec delay using timer interrupt 0 in 16-bit mode in assembly language for 89s51.
Sun Aug 30 2009, 10:44 AM
#2
well i explained many times..

create 50ms timer and then use a counter to count 100. coz 100*50 = 5000ms = 5sec
Sun Aug 30 2009, 03:14 PM
#3
my friend i wannna do it using timer interrupt and hope u give me program for that.
Sun Aug 30 2009, 07:42 PM
#4
Well i cant give your a program, but you can do that in interrupt.. just add the counter logic in interrupt routine.

write something yourself, i will rectify it incase of any errors. unless you try you wont learn.
Mon Aug 31 2009, 07:33 AM
#5
Let me explain you the steps to perform Timer interrupt0:-
----------------------------------------------------------------------
1. Enter "IE" reg. value to initialize the timer0 interrupt.
2. Enter the "TMOD" reg. value to select the timer0 with 16-bit mode.
3.Enter the values at "TH0 & TL0" as per the time delay you requested.
ex:-If 12MHz XTAL connected means, the constant time delay taken between each count is 1┬Ásec. Else if 24MHz XTAL means, then 0.5┬Ásec is the constant time delay.
4. Start the timer0.
5. Write the ISR program under the pre-defined Timer interrupt 0 address.
Mon Aug 31 2009, 11:33 AM
#6
MR GOPI AND AJAY

I AM SENDING U MY PROGRAM USING ADC 0804 HERE I AM DISPLAYING 336V WITH THREE 7 SEGMENT DISPLAY.

SO WHEN I MAKE MY MACHINE ON DURING CAPACITOR TAKES 3 SECONDS TO CHARGE UPTO 336V
SO I NEED TO PUT DELAY FOR 5 SEC TO ALLOW NOT TO GET OL ERROR AROUND 220V TO 200V WHEN I PROVIDE SUPPLY. FOR FIRST TIME U WILL BE ABLE TO GET IT AND I WANNA USE TIMER INTERRUPT TO CHECK OL VOLTAGE AFTER EVERY 5 SEC. I AM ATTACHING MY PROGRAM WITH THE HELP OF TIMER VERIFY WHETHER I AM CORRECT.
Tue Sep 01 2009, 04:34 AM
#7
I didnt see any attachment here???????????????
Tue Sep 01 2009, 03:59 PM
#8
hiiiiiiiii this is program
Wed Sep 02 2009, 07:50 AM
#9
Where is it????????
Wed Sep 02 2009, 08:04 AM
#10
Ok Buddy. I am sending one reference code where a set of leds connected to PORT1 has to be blinked for every 1sec using timer0 interrupt with 16-bit mode. The XTAL used is 11.0592.

                     temp data 40h
                     cnt    data 00h

                      org 00h
                      ljmp main

                      org 0bh
                      clr tr0
                      djnz cnt,down
                      mov cnt,#14
                      mov a,temp
                      cpl a
                      mov temp,a
                      mov P1,temp
                      mov th0,#0
                      mov tl0,#0
down:            setb tr0
                      reti

main:             mov cnt,#14
                     mov temp,#55h
                      mov tmod,#01h
                      mov th0,#0
                      mov tl0,#0
                      mov ie,#82h
                      setb tr0
                      sjmp $


[ Edited Wed Sep 02 2009, 12:05 PM ]

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Sun Apr 30 2017, 05:49 AM
Lijin G Varghese
Can u send me the circuit diagram for Program to interface GSM Module with 8051 microcontroller (AT89C51) using PC and LCD
Sun Apr 30 2017, 05:48 AM
Lijin G Varghese
Program to interface GSM Module with 8051 microcontroller (AT89C51) using PC and LCD
Fri Apr 28 2017, 03:47 PM
SANDEEP T S
I need pcb wizard 3.5 version kindly send valid link of yours
Fri Apr 28 2017, 03:46 PM
SANDEEP T S
I need pcb wizard 3.5 version
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I want circuit & program for radar detection using Microcontroller 8051
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Hi Ajay ....hope you and your family all will be fine are you working on andriod aplications if yes then plz reply me
Sun Apr 09 2017, 06:33 PM
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Dear Sir, I need to know what are the complexity for programming in 8051 Microcontroller for three phase inverter?
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ATHULYA NAIR
Dear Sir,
Sun Apr 09 2017, 04:43 AM
Rohit chandra joshi
Sir I need ur help urgently.i am trying to make pc controlled led scrolling display using 8051.when i am trying to generate hex file of the code that is given by pratik suthar.it gives the error Target not created Limit:0800h I am using keil uvision4 software. Even i have tried to burn the given hex file that is atteched with the code but my led are not glowing. Pls help me sir .i struck in this problem from last month and till now i am not able to short out the problem. Pls suggest me to solve the problem.mail me at [email protected] Thanks

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