CTC Opeartion Issues

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Tuurbo46
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Posted by Tuurbo46: Sun. Sep 11, 2016 - 03:08 PM
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Hi.

 

OK, I have an ATmega324PA, and when I program this chip with and ICE3 the CTC on Timer1 works, and flashes the LED.  If I power off, and restart the micro, the CTC does not work.  If I blow the code again, and leave the programmer connected the CTC works.

 

What happens after the code is blow, does it clear the interrupts, or is it holding the micro in reset.  I cant understand how the code works after being blow, but not on restart?

 

Look forward to your reply.

 

Thanks,

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AVR Microcontrollers, megaAVR and tinyAVR
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Brian Fairchild
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Posted by Brian Fairchild: Sun. Sep 11, 2016 - 03:44 PM
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Post the smallest amount of source code that demonstrates the problem, and a schematic of your hardware along with your fuses values.

#1 This forum helps those that help themselves

#2 All grounds are not created equal

#3 How have you proved that your chip is running at xxMHz?

#4 "If you think you need floating point to solve the problem then you don't understand the problem. If you really do need floating point then you have a problem you do not understand." - Heater's ex-boss

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jgmdesign
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Posted by jgmdesign: Sun. Sep 11, 2016 - 04:35 PM
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DO you have a pullup resistor on the Reset line?  10k is the normal.  The ICE is probably holding the reset line high for you.

 

Tuurbo46 wrote:
I program this chip with and ICE3

I am guessing you mean jtagice3?

 

JIm

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DocJC
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Posted by DocJC: Sun. Sep 11, 2016 - 06:50 PM
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What else is conected to the uC?

 

What is your power supply?

 

Make sure you have a good ground connection between the power supply and the uC, sometimes when the uC only works with the programmer connected it is because the programmer is supplying the ground connection.

 

JC

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theusch
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Posted by theusch: Mon. Sep 12, 2016 - 01:43 PM
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DocJC wrote:
Make sure you have a good ground connection between the power supply and the uC, sometimes when the uC only works with the programmer connected it is because the programmer is supplying the ground connection.

That would also be my first guess.

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Tuurbo46
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Posted by Tuurbo46: Mon. Sep 12, 2016 - 06:35 PM
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Hi,

 

All solved, you were correct it was a GND issue.  It is always nice to have someone else's input.  I was adamant it as a software problem.

 

Anyway, thanks again for all your help.

 

Tuurbo46

 

 

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