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intan
Joined: 16 Feb 2009
Posts: 46
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 24 Jun 2009 4:17 mclr/vpp |
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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
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hanif
Joined: 14 Feb 2007
Posts: 66
Helped: 5
Location: Pakistan
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intan
Joined: 16 Feb 2009
Posts: 46
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24 Jun 2009 15:47 mclr pull up resistor |
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| i dnt understand. can explain more detail. thank you
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blueroomelectronics
Joined: 17 Sep 2006
Posts: 1681
Helped: 99
Location: Toronto, Canada
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24 Jun 2009 16:11 mclr vpp low |
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| 4.7K is a little low, I use 10K or 22K it's just a pullup so it's not critical.
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24 Jun 2009 16:11 Ads |
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yvp
Joined: 14 Jun 2009
Posts: 6
Location: kanpur
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04 Jul 2009 8:19 mclr resistor |
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| i too used 10k, but if u use a reset supervisor , u may not need any of these
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pranam77
Joined: 22 Apr 2008
Posts: 986
Helped: 84
Location: Mangalore(India)
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04 Jul 2009 8:51 mclear vpp |
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| 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
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siongboon
Joined: 24 Jan 2006
Posts: 285
Helped: 25
Location: Singapore
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07 Jul 2009 15:34 mclr vpp circuit |
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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.
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GSM Man
Joined: 15 Apr 2009
Posts: 354
Helped: 46
Location: New Jersey, USA
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07 Jul 2009 15:45 mclr vpp |
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| 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.
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