The value of pull up resistor connected to MCLR

[intan]

hi! i m confused with the pull up resistor connected to mclr of pic. i do a searching and find out a few value such as 10K or 4.7K. which value is recommended? how to determine it?
thanks

 

[hanif]

mclr vpp

Hi,

Kindly view this topic, it includes some calculations regarding pull up resistor value. This may help you.



also there is another link

https://www.picbasic.co.uk/forum/archive/index.php/t-2965.html

Regards

 

[intan]

mclr pull up resistor

i dnt understand. can explain more detail. thank you

 

[blueroomelectronics]

mclr vpp low

4.7K is a little low, I use 10K or 22K it's just a pullup so it's not critical.

 

[yvp]

mclr resistor

i too used 10k, but if u use a reset supervisor , u may not need any of these

 

[pranam77]

mclear vpp

Practically 10K is optimum for MCLR pull up. You may directly use that. No claculations are required as it is just to pull the pin HI. Good luck

 

[siongboon]

mclr vpp circuit

The range of value is quite wide.
I usually don't compute it, and just use 10kohm.
Using too low ohm will drain away more current.
Too high ohm the reaction time for the reset circuit might have some issue perhaps.

 

[GSM Man]

mclr vpp

Microchip recommends a 10K pullup resistor on the MCLR line. If you use a debugger (ICD2, ICD, REALICE, etc.) and the resistor is too small it may prevent the debugger from resetting the uP. Also, DO NOT place any capacitors on the MCLR line or it may also interfere with the debugger.