Michael Ghormley wrote:
> Maybe this is plastered all over the documentation,
> but I sure didn't see it!

I'm afraid it's there alright.  I went through the data sheet with
a fine toothed comb the first time I got it.

Microchip PIC12C5XX Data Sheet
Section 7.2.5 INTERNAL 4 MHz RC OSCILLATOR
Page 28 of DS40139B

        "In addition, a calibration instruction is programmed into
        the top of memory which contains the calibration value for
        the internal RC oscillator.  This value is programmed as a
        MOVLW XX instruction where XX is the calibration value, and
        is placed at the reset vector.  This will load the W register
        with the calibration value upon reset and the PC will then
        roll over to the users program at address 0x000.  The user
        then has the option of writing the value to the OSCCAL
        Register (05h) or ignoring it."

See also same page the reset conditions for registers; PC is set to
something which ain't zero.

--
James Cameron                              (james.cameron@digital.com)
Digital Equipment Corporation (Australia) Pty. Ltd. A.C.N. 000 446 800