PIC 16F84A OVERCLOCKED!!

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RAT16F88
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PIC 16F84A OVERCLOCKED!!

Post by RAT16F88 » Sat Nov 27, 2010 11:00 pm

To day when I was soldering up a Led flasher circuit I just snatched out a 28.224 Mhz crystal from an old modem circuit and fixed it just to test.
At 1st attempt(2.4v-which worked earlier) it didn't worked as expected.
but I tried givinga bit high voltage combining 2 rechargeable cells(3.7v+2.4v=6.1v)
whoops!! :shock: :shock: :shock: :shock: it started to work.I'm so impressed thats why I put this on.
This is also th 1st time I've encountered such a thing. :? :? :? :?
:?: :?: :?: please can experts tell me why then the microchip data sheet explains maximum clock <= 20Mhz. :? :? :?
Please mind me if this looks stupid. 8-) 8-) 8-) 8-) 8-)

Code: Select all

int clk  ;
void main() {
  PORTB = 0;
  TRISB = 0;
  clk = Clock_mhz();
  Eeprom_Write(0x01,clk);
 while(1) {
    PORTB =  ~PORTB;
    Delay_ms(1000);
  }
}
EEPROM read after execution

Code: Select all

FF1CFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFF
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Neo
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Re: PIC 16F84A OVERCLOCKED!!

Post by Neo » Sun Nov 28, 2010 2:32 am

Read Overclocking and cooling about this topic. When you increase power and clock frequency, you will have to consider about cooling the chip as well.
RAT16F88
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Re: PIC 16F84A OVERCLOCKED!!

Post by RAT16F88 » Sun Nov 28, 2010 10:28 am

Thanks Neo
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tuxbotix
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Re: PIC 16F84A OVERCLOCKED!!

Post by tuxbotix » Mon Jun 20, 2011 11:41 am

The same technique used in PC overclocking, increasing FSB freq. and multiplier [final freq=fsb*multiplier] and also increasing core voltage :P I doubt that the pic will heat as the frequency isn't a big amount and the voltage less than in absolute maximum ratings as i can remember
RAT16F88
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Re: PIC 16F84A OVERCLOCKED!!

Post by RAT16F88 » Mon Jun 20, 2011 11:35 pm

You are welcome MR.TUXBOTIX :D :D :D
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