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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