How to connect crystal for Timer1 in PIC16f87x

[coolchip]

connecting crystal for microchip

Shall I use capacitors as well ?
What about mclr pin? Should it be grounded or left open?
thanks

 

[xmli1976]

There are many informations in PIC16f87x's datasheet you can refer.

 

[leomecma]

For MCLR pin you have to pullup it using a 10K resistor. Use NPO capacitors between 18 and 33pF. It's value depends of crystal value ... in datasheet has a list of values for each crystal, but the correct is your crystal vendor give you the correct value for that especific crystal ...

look this links:
https://www.microchip.com/stellent/idcplgIdcService=SS_GET_PAGE&nodeId=1490&filterID=414

leomecma

 

[ragabs]

take care that the improper capacitor value may cause one of two
1-not accurate timer.
2-the controller may not work.
that is according to the difference between the proper and the improper value


to get the proper value
--check the datasheet of the crystal u will use

 

[coolchip]

h**p://www.microchip.com/stellent/idcplgIdcService=SS_GET_PAGE&nodeId=1490&filterID=414
isn't working.
I can't find datasheet for my 32.768khz crystal
thanks for all help!

 

[leomecma]

This link work with me: if isn't work go to www.microchip.com -> appl notes -> oscillator
**broken link removed**

If you don't need a very accurate timer you can use this 33pF that will work well, but if not you need know the load for your crystal ....

look in file above the suggestions from Microchip

leomecma