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Hi,

The Coprocessor0 timer (count register) is running at half the PCU speed. It's a permanent free running timer (there is no way to stop it if the CPU is running unless you use debug register).

When you restart your SW it may happen that the count register has overflowed the compare register. In this case, it will only generate an interrupt after reaching 0xFFFFFFFF.

I made the experiment yesterday on my starterkit. Let's assume you run at 80MHz and you generate an interrupt every 1 ms with the coretimer.

It means you put 4.000.000 into the compare register.

When you stop the running program, when you restart your program the counter may have overflowed 4.000.000.

Let's take an example : let's imagine  counter register has reached 4.000.001 ( 0x3D 0901) when you restart.

To get the next Coprocessor timer, it will take ( 2^32 )    0x1 00000000 -  0x3D 0901 = 4.294.967.296 - 4.000.001 = 4.290.967.295 counts to reach interrupt.

The internal timer increments at half the CPU clock i.e every 25ns so it takes : 107 seconds (1mn 47s)

I did the experiment myself and in fact you'll see that interrupts restart after (maximum) a couple of minutes. It depens of your compare value and how long you waited before restarting your SW.

If you push RESET icon in MPLAB, you'll see that coprocessor timer interrupts operate as expected.

In the C32 compiler manual, you'll find at section 5.7.2.9.3 that the count bit in the debug register enable the user to control if count register continues incrementing or not during debug.

I did not experiment it but it should work ;=)

Regards

Ok thank you. I will try to configure the debug register...

I didn't wait so long to see if the timer reach the interrupt, but it seems logical.

Regards

Hi Mike,

I have just bought the PIC18F4331 because I am needing to use 4 PWM outputs in a project, but I'm having troubles with the programming... everytime I try to program the PIC, it shows me an error like this.... "ERROR-> De escritura en dirección 0x000000"

I have already changed the USB cable, I used PIC PROG 800  with the WINPic 800 program, I used Masterprog also, and it keeps making the same error.

These programmers work very well programming the PIC18F4550.

Some people told me that mi PIC was broken down, but I bought 5 of them, and they are new, and all of them make the same error.

So I was thinking about a problem in my Configuration bits.

Any suggestions on how I could make things work with this PIC, or if I have to buy another programmer , would be appreciated..

Thanks

Luis Moran

Good evening,

I need your help with the testing program STM32L152RBT6STM32L152RBT6 because every time I write a personal program by following the guides and the examples I will execute without errors but when I dump the card I notice STM32L152RBT6STM32L152RBT6 qu'iln'ya no response and nothing new is happening?

well thank you to answer me because I need your help and it is urgent because it is una advantage of my project about the end of PFE study that I need to file the report before the end of May and thank you very much

Hello and best regards,

Cordialment

Hi Ayari,

This forum is dedicated to PIC microcontrollers only...If you want support for STM32L152RBT6STM32L152RBT6, you should go to the website of the maker of this product.

If you use a Microchip 32 bits (PIC32MX), you can get support on this website

Regards

Hi, just a quick general question..
Im doing a little bit of research and I haven't been able to find the ESD Human Body Model rating for any of Microchips PIC family of controllers.

If you can help me with this information I would really appreciate it!

Thanks,

Teresa

Hi Teresa

I found this info on the microchip website

http://support2.microchip.com/KBSearch/KB_StdProb.aspx?ID=SQ6UJ9A001VUZ

ESD searches on thier website seem to bring up a few results like this.

thanks

Carl

Thx carl , this info is all over our website , some folk have no idea how to find things eh ? Cheers mike

Sent from my iPhone

Hey Mike.

My friend and I recently bought an NXP-LPC1313FBD48 and an FTDI TTL-232R-3v3 cable(part 34M887

Hi Jack,

This forum is dedicated to MICROCHIP products only...If you want support for NXP-LPC1313FBD4, you should go to the website of the maker of this product.

If you use a Microchip 32 bits (PIC32MX) or any other MICROCHIP device, you can get support on this website ;=)

Regards