LVP Programming

[ParkingLotLust]

Is it possible to program a PIC 16F873A or 16F84A using an LVP cable? I read over the 84 datasheet, but I didnt find anything. Im looking to build a LVP cable because I cant get my hands on a 12v zener in less than a few weeks, and I need to program a chip or two before next week. Thanks.

 

[Hero999]

Can't you use some lower voltage zeners in series?

Like two 6V units or an 8V and 4V unit.

 

[ParkingLotLust]

Unfortunately I only have the 5.1v zener's on hand, and in series thats only 10.2v. I suppose I could use an LM317 and just use a regulated supply instead of zeners?

 

[Hero999]

Of course you could, if you really want to use diodes then add two normal rectifiers in series with the zeners to make 12V.

Anyway I don't understand your question or PICs so I can't help you with this unless it's propper electronics.

 

[ParkingLotLust]

My question is: can I program a PIC 16F84A or 16F873A using one of **broken link removed** And for a normal programmer, I can just go (5.1 zener)-(5.1 zener)-(1N4148)-(1N4148)-(1N4148) (needed the third one, since 5.1+5.1+0.6+0.6+0.6=12) and that will work in place of a 12v zener? Awesome, thanks.

 

[Papabravo]

What voltage do you get if you apply a 10% tolerance to each part? Oh...you thought zeners were more precise than that...sorry Charlie.

 

[Nigel Goodwin]

LVP (Low Voltage Programming) is only available on specific PIC's, consult the datasheets to see if they support it, I don't think either of the two you've listed do support it?. It's also a VERY unused feature, as it wastes a PIC pin, and isn't really much simpler than a conventional HVP programmer.

 

[Mike - K8LH]

The 16F873A supports LVP but not the 16F84A.

 

[ParkingLotLust]

Alright, thanks.