PIC16F877a

[TKS]

MCLR,

can anyone help me one moment telling me which value the c1 needs
if you see page 148 from the sheets, you have to make a network over there...whit that pin...(recommend..)

is only a resistor not sufficient..??
and if not which value you need for c1...

VDD
|
| |r1
| |
|
|======_r2__=== pin mclr
|
|
_
()c1
|
|
0 volt

planning for r1=10K and r2=1K

 

[Nigel Goodwin]

is only a resistor not sufficient..??
and if not which value you need for c1...

Just a resistor is fine, if you are not intending adding a reset switch, a wire link if fine as well - I usually just connect MCLR directly to +5V.

The idea of a resistor/capacitor combination is to slow the rise of the MCLR pin, basically to allow the HT rail to settle before the PIC starts running - but PIC's seem very happy without it, and even include an in-built timer for this function that you can select in the config fuses (if you want to).