At 09:21 12/11/99 +0100, you wrote:

Have you selected the XT oscillator option in the config word?

Jim


>Hi PICer friends,
>
>I'm using the 16F877 for the first time and I have trouble to start the xt
>oscillator.
>
>the connection on the 16F877 are:
>
>vcc - to pin 11 - 32 wired togheter
>gnd - to pin 12 - 31 wired togheter
>mclr - to wcc thorught a resistor of 10K
>xt osc - to pin 13 and 22 pf capacitor to gnd
>xt osc - to pin 14 and 22 pf capacitor to gnd
>rb3 - floating  (but have been tested connected to the vcc and gnd)
>
>the xt are a 4 Mhz quartz
>
>Using the blink8x.bas sample program in PBP 2.2 I compile it and I'm able to
>load the hex into the pic and I can read back the code (that means the PIC
>is working) but the oscillator do not start.
>
>On pin 14 I can see with a scope a stable level of 2,6 volt and on pin 13 a
>stable level of 2,0 volt .
>
>Dear PICer friends, do you have any idea to help me to solve this problem?
>
>
>Ciao
>
>Leo
>
>
>For reference purpose you can see the PBP blink8x.bas source:
>
>i       var     byte    ' Define loop variable
>LEDS    var     PORTD   ' Alias PORTD to LEDS
>TRISD = %00000000       ' Set PORTD to all output
>loop:   LEDS = 1        ' First LED on
>Pause 500       ' Delay for .5 seconds
>For i = 1 to 7  ' Go through For..Next loop 7 times
>LEDS = LEDS << 1        ' Shift on LED one to left
>Pause 500       ' Delay for .5 seconds
>Next i
>Goto loop       ' Go back to loop and blink LED forever
>End
>
Regards,

Jim Robertson
NEWFOUND ELECTRONICS
________________________________________
Email: newfound@pipeline.com.au
http://www.new-elect.com
MPLAB compatible PIC programmers.
________________________________________