Do a read on the chip and make sure the osc setting is on xtal and not
rc. I've been having this problem reccently and I can do a program and
verify and all looks ok but if I read the chip it then shows me the osc
is set to rc and not xtal despite the fact that i programed it as xtal.
Regards
Stuart

John Hansen wrote:
>
> My previous development experience has been mostly limited to the flash
> parts, so I may be missing something.  I have a simple circuit put together
> on my breadboard that simply feeds 5 volts to an 18 pin PIC and attaches a
> 4 Mhz ceramic resonator to the appropriate pins.  There are no other
> connections (I stripped this down to try to eliminate sources of potential
> error).   The program I am using simply sets the TRIS registers to outputs
> and then takes all of the pins high.  When I plug a 16F84 into this circuit
> it performs as expected.  The pins are high and my frequency counter reads
> about 4 MHz on the resonator pins.  When I plug a windowed 16CE625 into the
> same position, I get nothing.  Not only are the pins not high, but there is
> no reading on the frequency counter.  From the data sheet it looks like
> these chips should be pin compatible.  Is there some trick to getting a
> 16CE625 to run?  I've tried this with 2 different windowed 625's with the
> same result in both cases.   The 625's are new -- came from DigiKey
> today.  Thanks in advance for any assistance.
>
> John Hansen
>
> Here's the code for the 16CE625 version.  My programmer verifies it as
> being in the chip.
>
>                   list                  p=16CE625
>                  __CONFIG   0X3FF9
>                  org                 0x00
>                 movlw           0x00
>                 clrf                0X05
>                 movlw           0x07
>                 movwf           0X1F
>                 BSF              0X03,5
>                  MOVLW       0X00
>                  MOVWF       0X85
>                 MOVLW       0X00
>                 MOVWF       0X86
>                 BCF              0X03,5
>                 MOVLW       0X1F
>                 MOVWF       0X05
>                 MOVLW       0XFF
>                 MOVWF       0X06
> DONE    GOTO    DONE
>                END
>
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