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fuse bits in micro-controllers

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hi.........
can anyone please tell me what actually fuse bits are??? I know its used for configuring ports and peripherals in microcontrollers... but how is it actually implemented and which all registers are used for it if we refer to pic controllers....also can we do it in the main program by accessing the respective registers....

Thanks in advance:)
 

From the other thread, I've read that you used the 16F877A. Maybe you're referring to the configuration bits of the PIC.

Here you can read about the fuse bits of the AVR microcontroller:
http://www.scienceprog.com/programming-avr-fuse-bits-oscillator-settings/
http://www.ladyada.net/learn/avr/fuses.html
**broken link removed**

You can read about the configuration bits of the PIC here:
27 Section 27. Device Configuration Bits
www.edutek.ltd.uk/Binaries/Datasheets/Micro/PICDeviceConfig.pdf

Hope this helps.
Tahmid.
 
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