Minimum circuit required to run PIC16877A

Thread Starter

Vindhyachal Takniki

Joined Nov 3, 2014
477
1. Attached is the circuit using PIC16F877A.
I need external oscillator in my project of 20Mhz.

2. Is this ckt ok to have bare minimum?
I have seen people use different values at MCLR, are values selected in ckt ok?

3. Also oscillator caps, some use 30pf, I think 20pf will also work?
 

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dannyf

Joined Sep 13, 2015
2,197
The minimum circuit consists of just the mcu.

As your definition of "minimum" changes the minimum circuit changes as well.
 

Picbuster

Joined Dec 2, 2013
983
1. Attached is the circuit using PIC16F877A.
I need external oscillator in my project of 20Mhz.

2. Is this ckt ok to have bare minimum?
I have seen people use different values at MCLR, are values selected in ckt ok?

3. Also oscillator caps, some use 30pf, I think 20pf will also work?
looks ok.
the resistor value at the master clear are not critical but needed when you use a progger.
A progger will use the master clear and will not accept a impedance above a certain value.( the cap via resistor to mclr)
The look at the xtal spec's they give you the correct value and value damping resistor normally 10Mohm.
 
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