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| Search found 8 matches |
| Author | Message |
|---|---|
 Topic: 18F2520 Timer Setup Problem |
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| R0B0T1CS Replies: 15 Views: 15079 |
 Forum: General CCS C Discussion Posted: Mon Jul 06, 2009 9:48 am Subject: 18F2520 Timer Setup Problem |
Hey, I got it working  ... half of the time :\
Here's how to make the 18F2520 function properly at 40Mhz. 1-In the ICD interface window I used the "Advanced" tab to manually set the uC ... |
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| Topic: 18F2520 Timer Setup Problem |
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| R0B0T1CS Replies: 15 Views: 15079 |
Forum: General CCS C Discussion Posted: Mon Jul 06, 2009 7:33 am Subject: 18F2520 Timer Setup Problem |
| If the 18F2520 is programmed and powered, whether it is being dissabled by the ICD or not, it runs the same and produces a wave form which is ~140us square wave with 59% duty cycle.
PCWH 3.209 #in ... |
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| Topic: 18F2520 Timer Setup Problem |
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| R0B0T1CS Replies: 15 Views: 15079 |
Forum: General CCS C Discussion Posted: Sun Jul 05, 2009 11:21 pm Subject: 18F2520 Timer Setup Problem |
| wait, wait... now I see.
The second osc statement you highlighted, which I somehow missed seeing before, is extra code I missed commenting out of what I posted here. //NOWDT,NOMCLR,INTRC_IO,NOPBADEN ... |
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| Topic: 18F2520 Timer Setup Problem |
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| R0B0T1CS Replies: 15 Views: 15079 |
Forum: General CCS C Discussion Posted: Sun Jul 05, 2009 10:24 pm Subject: 18F2520 Timer Setup Problem |
| no change.
I haven't even told the program to "run" and the output is being provided. hitting "run" in the icd control gui changes nothing. Also, if 2 osc setup statements is & ... |
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| Topic: 18F2520 Timer Setup Problem |
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| R0B0T1CS Replies: 15 Views: 15079 |
Forum: General CCS C Discussion Posted: Sun Jul 05, 2009 7:38 pm Subject: 18F2520 Timer Setup Problem |
| pcwh 3.209
The PIC functions the same even when no OSC is connected. #include "18F2520.h" #device icd=true #device *=16 ADC=8 #fuses HS,NOPROTECT,NOLVP,NOWDT,PUT,NOBROWNOUT //////NOW ... |
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| Topic: 18F2520 Timer Setup Problem |
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| R0B0T1CS Replies: 15 Views: 15079 |
Forum: General CCS C Discussion Posted: Sun Jul 05, 2009 5:17 pm Subject: 18F2520 Timer Setup Problem |
| Actually, if I have NO Osc or TX connected, it still has the same timing. Something Internal is triggering the uC. How do I turn it off?
I'm using a scope on a real circuit. |
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| Topic: 18F2520 Timer Setup Problem |
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| R0B0T1CS Replies: 15 Views: 15079 |
Forum: General CCS C Discussion Posted: Sun Jul 05, 2009 3:55 pm Subject: 18F2520 Timer Setup Problem |
| Using a 20MHz crystal, instead of the 40MHZ Oscillator, doesn't improve anything. Produces signal is now 7us instead of 80us.
Actually, if I have NO Osc or TX connected, it still has the same timin ... |
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| Topic: 18F2520 Timer Setup Problem |
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| R0B0T1CS Replies: 15 Views: 15079 |
Forum: General CCS C Discussion Posted: Sun Jul 05, 2009 2:42 pm Subject: 18F2520 Timer Setup Problem |
| I usually use the 18F452, but today it's the 18F2520.
Even with the oscillator disconnected, the output pin provides a 59% duty cycle 136us period square wave. If the pin address is changed the outpu ... |
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