Problem in Interuppt Program

If CY is carry, May i ask what are CL, CH, CCF1, CF, CCAP1L, CCAP1H, CCAPM1, CMOD and CR?

what do they stand for?

Your code would be much easier to read if you gave meaningful symbolic names to your constants (rather than just use magic numbers), and documented (in comments) what your code is supposed to be doing.

Do this now - the exercise on its own might well lead you to your problem!

one more case of "secrecy"

I am using timer0 with 250ms
sounds as iof you are using a very low oscillator ferquency, but you want to keep it secret what it is

I have not used any special registers of the chip AT89C51ED2
and the you go ahead and use the PCA which makes another poster (that need to read The PCA cookbook
www.intel.com/.../270609.htm ) ask "what are these?"

full info, commented code then maybe someone can help you.

Keeping things secret (missing info scribbles (without comments nothing can be called 'code") are not conductive to getting an answer.

Erik

"I have not used any special registers"

Not forgetting, of course, that the 'S' in "SFR" stands for "Special"...!

;-)

Rajeesh:

I can't help but notice that you don't put any comments in your code (or you feel like you need to take them out before posting).

I think that many folks put in comments to tell others what the code does. However, I believe it is equally important to tell reviewers what you WANTED the code to do.

It would be considerably easier if you put in comments to that effect. Otherwise, how could anyone tell what your desire was/is?

Best Regards,

-=Rich=-

Hello Hems Raj,

First Learn the Registers what are present other than Lowend 8051.

There are advanced 8051.

Please go through the registers of ED2.

Please dont confuse yourself and confuse others.

void timer_routine(void) interrupt 7  using 2
{
    EA=0;        //disable all interrupt
    CL=0x5F;     //loading 0xfo5f to pca counter
    CH=0xF0;
    CCF1=0;      //clearing capture compare flag
    CF=0;        //clearing pca counter overflow flag
    P2_6=~P2_6;     //complementing the portpin
    EA=1;           //enable all interrupt
}

void main()
{


                IEN0=0xC0;  //enable all interupt and pca interupt
                TMOD |=0x02; //set timer0 as timer
                TL0=0x00;   //reload timer value as 0x1800
                TH0=0x18;
                TF0=0;
                CMOD=0x05;  //select timer 0 as pca clock and enable pca capture interupt
                CCAP1L=0x0A; //filling non zero values
                CCAP1H= 0x4F;
                CCAPM1=0x49;  //setting ecom1 and mat1 and eccf1bits to use as software timer and enabling capture interupt
                CL=0x5F;   // filling the pca timer
                CH=0xF0;
                CCAP1L=0xFF; //filling the capture ,compare modules
                CCAP1H= 0xFF;
                TR0=1;    //run timer0
                CR=1;    //run pca timer
                P2_6=0;



                while(1);

}

ok,
got any link ?

Could you tell me this:

the advanced 8051 instruction set that you say works on uvision2?

rgds,

got any link ?

either give this up and go buy a broom or start figuring the SIMPLEST things out by yourself.

question 1: who makes tha chip
question 2: does that company have a website
question 3: does that webpage have a search window
question 4: do you know how to type into such a window
question 5: do you think that would be the way to do it

Erik

you were told:
There are advanced 8051.
Please go through the registers of ED2. that, cutting it in cardborad, should have been the SFRs of ED2

you ask
the advanced 8051 instruction set that you say works on uvision2?
1) who said ANYTHING about "instruction set"
2) there is no "advanced instruction set"
3) if you took the time to do what Rajesh suggested BEFORE posting another ELEMENTARY question you would not need to ask.

Erik

Read "the bible" 5 times or more, then read the ED datasheet 5 times or more, then when you have a question that can not be figured out by a 5 year old come back.

Hey, cool it,
/* kidding, */

sory

The comments are an improvement, but it's still a mass of magic numbers; eg,

CCAPM1=0x49;  //setting ecom1 and mat1 and eccf1 bits
              //to use as software timer and enabling capture interupt

Are you sure that 0x49 is the right magic number for that particular set of bits? Wouldn't it be much clearer (and, hence, more maintainable) to define symbolic constants and write, say:

CCAPM1 = ECOM1 + MAT1 + ECCF1; //to use as software timer and enabling capture interupt

"in all EEPROM programs I have used EA=0 and EA=1 at begining and end of program."

What do you mean by that?
Are you confusing "program" with "function"?

"If there is any suggestion"

If your timer code works alone, and then stops when integrated with something that's fiddling with the EA flag, I think there could be a clue there somewhere...

Somebody like who 's got an eye for detail could fix up the error..