Re: [Usbpicprog-technical] PIC16F84A support

[Francesco M. <f18...@ya...>]

Hi,
    sorry for the long delay, but better late than never :)

Frans Schreuder ha scritto:
>>> I don't think it should be very different, do you have the latest firmware?
>>>     
>> I should have the firmware 0.1.1; I'll see what happens with the firmware in trunk.
>>   
> Yes, try that one... It's also compiled, so you can just load the hex 
> file...
I'm successfully using UPP with PIC16F84 and the very latest trunk firmware 
since some week. I thought to report it here to close this thread :)


>> good idea; I'm currently using a cable 27cm long. I'll try with a shorter one 
>> even if the electrical length of the cable at 8Mhz is about
>>
>>   L = 0.27/37 = 0.0073
>>
>> which I think could be considered negligible.
>>   
> In terms of wavelength you are absolutely right, but what about inductance?
> If we consider the wire to be 1.5nH per millimeter, you get something 
> like 400nH which will result in 20 Ohms reactance at 8MHz. Luckily the 
> programmer doesn't run at 8 MHz, but something closer to 1MHz, so this 
> wouldn't be a big problem, it's just a couple of ohms.
Indeed, you're right. I'm used to think in terms of electrical lengths but I 
shouldn't have overlooked the wire inductance :)

> But you shouldn't make them much longer than that!
Ok!

Francesco

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