Code running 19 times slower than intended

[Bruce]

Dave,

Are you sure you're not using the LF version running at 3V?

[mackrackit]

Yes, I just doubled checked, again.

Do not laugh at the messy board, everything on it runs at 3.3 volt. Another interesting thing is this chip can also be programmed at 3.3. I have the PicKit2 feeding a LM317. The PicKit is fooled into thinking it is running at 5 volts.
Along with the SD card there is a MAX6675 and a DS1337. Working on a PYRO LOGGER.

And the data sheet is a bit miss leading?
I take the extended range (LF) as going down to 2 volts.
I guess I could have a batch that was labeled incorrectly?

[Bruce]

Are you running it at 48MHz @ 3V?

[mackrackit]

Yup, with a 4MHz external purchased from you

DEFINE OSC 48
@ __CONFIG   _CONFIG1L, _PLLDIV_1_1L & _CPUDIV_OSC1_PLL2_1L & _USBDIV_2_1L
@ __CONFIG   _CONFIG1H, _FOSC_HSPLL_HS_1H
@ __CONFIG    _CONFIG2H, _WDT_OFF_2H & _WDTPS_512_2H
@ __CONFIG    _CONFIG3H, _PBADEN_OFF_3H & _MCLRE_OFF_3H 
@ __CONFIG    _CONFIG4L, _LVP_OFF_4L & _ICPRT_OFF_4L &_XINST_OFF_4L

[Bruce]

Well that's interesting. So much for those worthless voltage-to-frequency graphs in those darn data sheets ehh...;o)

If it works - it works - can't argue with that.

[rsocor01]

I'm also running my PIC18F4550 with a 4MHz external oscillator at 3.0V. I use the HSPLL setting for the oscillator. The define osc line is

DEFINE OSC 48

and it seems to be working fine. I'm feeding data to a color GLCD and it does it very quickly.

Robert