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in_nursery
Joined: 25 Oct 2012
Posts: 51
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| 18F45K50 |
 Posted: Tue May 19, 2015 10:17 am |
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Hi all
I try to use a 18F45K50 but I have a strange problem.
| Code: | #include <18F45K50.h>
#fuses INTRC // Internal RC Osc
void main() {
setup_oscillator(OSC_4MHZ|OSC_INTRC);
output_high(PIN_B5);
} |
When I build in debug mode the output goes up.
When I build in release mode the output is not working.
Thanks in advance for your help. |
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PCM programmer
Joined: 06 Sep 2003
Posts: 21708
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| Posted: Tue May 19, 2015 7:24 pm |
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Do you have a pull-up resistor on your MCLR pin ? This will be a 10K
resistor if you use Microchip ICD3, or 47K if you use CCS ICD-U64. |
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in_nursery
Joined: 25 Oct 2012
Posts: 51
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| Posted: Wed May 20, 2015 5:44 am |
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yes The hardware is good
Finally it works with adding
| Code: | | #fuses NOICPRT // ICPRT disabled |
but I don't understand why I need to disable it. |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19480
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| Posted: Wed May 20, 2015 7:05 am |
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Read the data sheet....
| Code: |
3: Available only on 44-pin TQFP package devices. Program this bit clear on all other devices.
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It _must_ be disabled on 'all other devices'..... |
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in_nursery
Joined: 25 Oct 2012
Posts: 51
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| Posted: Wed May 20, 2015 7:21 am |
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| I use 44 pin TQFP |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19480
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| Posted: Wed May 20, 2015 7:40 am |
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| If so, setting the fuse, enables this feature, but then the resistor must be present on the clock line to bias this 'off' or the chip won't run, except with a debugger connected..... |
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in_nursery
Joined: 25 Oct 2012
Posts: 51
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| Posted: Wed May 20, 2015 8:37 am |
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| ok thanks |
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