Saving the OSCCAL value for PIC 12F629 / 12F675


Posted on Feb 26, 2013

The PIC 12F629 and 12F675 have a factory set oscillator calibration value written to the last program memory location during manufacture. When programming the PIC the programmer software should read this value out, merge it with the program data being written to the PIC, and then write it back.



However, since this calibration value is in the normal program memory area of the PIC it is quite possible to erase it. Once you've done this, working out what the value should be is not easy and without it the internal 4Mhz oscillator will not run at th




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