On Mar 26, 9:18 am, vasile surducan <[email protected]> wrote: > On Fri, Mar 26, 2010 at 6:45 AM, mattschinkel <[email protected]>wrote: > > > You guys can check /trunk/doc/dita/tutorials/images/icsp_circuit.jpg > > > But, I still think there should be a jumper in there at VDD. I am > > using PIC KIT 2 (clone) programmer now. The microchip software has a > > button to select weather to turn on 5v VDD. Other programmers do not > > have this in software so maybe it should be in hardware. > > > I also took a look at Jaluino schematic and I see no capacitor for > > power-up reset, why is this? Is it not needed? > > >http://www.justanotherlanguage.org/sites/default/files/jaluino_medium... > > Hi Matt, Mike, > > The reset through C10 and J7 is bullshit. > make R1 = 10k...33k so D1 can disappear, D1 is just for blocking current > flow from Vpp to Vdd. > put a 47nF to 100nF from MCLR to GND, near the PIC. > > With those will be OK. > > Vasile > > > > > Thanks, > > Matt. > Actually if you have a capacitor, it must be isolated by the diode, as shown on Microchip schematic, otherwise Vpp rise from +5V to +13V and drop from +13V to +5V can be too slow on some programmers.
It's a 2c part. My circuit is correct. While simpler circuits will mostly work, it's the "proper" solution, -- You received this message because you are subscribed to the Google Groups "jallib" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/jallib?hl=en.
