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40inD
Joined: 30 Jul 2007
Posts: 112
Location: Moscow, Russia
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| 0.7 v at pin 3 of 12f683 |
 Posted: Thu Dec 11, 2014 2:10 am |
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| Why can be a 0.7 v always at pin 3 of 12f683? |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19338
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| Posted: Thu Dec 11, 2014 2:56 am |
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Almost certainly not.
How are you measuring this?.
Is the chip actually running?.
Unless you have specified otherwise, this pin will be defaulting to being the clock out. If the chip is set for an internal oscillator, then probably something like a 1MHz signal on this pin. A DVM might well see this as a DC voltage. If the chip is set for crystal, then the voltage will depend on what is on the clock in pin. |
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40inD
Joined: 30 Jul 2007
Posts: 112
Location: Moscow, Russia
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| Posted: Thu Dec 11, 2014 6:06 am |
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Here are my FUSES:
| Code: | #FUSES NOWDT //Watch Dog Timer
#FUSES INTRC //Internal RC Osc
#FUSES NOCPD //No EE protection
#FUSES NOPROTECT //Code not protected from reading
#FUSES NOMCLR //Master Clear pin used for I/O
#FUSES PUT //Power Up Timer
#FUSES BROWNOUT //Reset when brownout detected
#FUSES NOIESO //Internal External Switch Over mode disabled
#FUSES NOFCMEN //Fail-safe clock monitor disabled |
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Ttelmah
Joined: 11 Mar 2010
Posts: 19338
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| Posted: Thu Dec 11, 2014 7:11 am |
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So you'll have a signal at 1/4 the clock rate coming out of pin 3. Fosc/4.
INTRC_IO is the setting if you don't want this clock.
Read the data sheet.
Section 3.1
"
7. INTOSC – Internal oscillator with FOSC/4 output
on OSC2 and I/O on OSC1/CLKIN.
8. INTOSCIO – Internal oscillator with I/O on
OSC1/CLKIN and OSC2/CLKOUT." |
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40inD
Joined: 30 Jul 2007
Posts: 112
Location: Moscow, Russia
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| Posted: Thu Dec 11, 2014 9:26 am |
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| Yes, i already got it. |
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