Post by thread:write cycles

Ok. I've been working with this one 16c84 for 200 cycles of build ->download ->place in circuit ->test. My question is how many times can you rewrite the eeprom program memory? I'm having great results and learning alot, then POOF, nothing works. Not even my first piece of pic code that simply turns an ouput on. Is it me, or do I need a new PIC? Brad

> > Ok. I've been working with this one 16c84 for 200 cycles of build > ->download ->place in circuit ->test. My question is how many times can you > rewrite the eeprom program memory? I'm having great results and learning > alot, then POOF, nothing works. Not even my first piece of pic code that > simply turns an ouput on. Is it me, or do I need a new PIC? Nominally listed at 100. Someone on the list tested at over 1000. I guess you're par for the course. Probably need another one.. BAJ

Brad, If you can download (and I assume read back and verify) your code, the PIC appears to function OK. Sounds like some external problem to me. Have you checked for clock signals (osc1+2) and correct power supply voltages on the PIC? You should be able to crash and burn the 16C84 codespace some 1000 times without problems assuming a new device was used initially. At 10:38 PM 14/08/96 -0400, Brad Pousland wrote: >Ok. I've been working with this one 16c84 for 200 cycles of build >->download ->place in circuit ->test. My question is how many times can you >rewrite the eeprom program memory? I'm having great results and learning >alot, then POOF, nothing works. Not even my first piece of pic code that >simply turns an ouput on. Is it me, or do I need a new PIC? > >Brad > >

Brad Pousland wrote: > > Ok. I've been working with this one 16c84 for 200 cycles of build > ->download ->place in circuit ->test. My question is how many times can you > rewrite the eeprom program memory? I'm having great results and learning > alot, then POOF, nothing works. Not even my first piece of pic code that > simply turns an ouput on. Is it me, or do I need a new PIC? > > Brad http://www.labyrinth.net.au/~donmck/84.html will give you an idea of how many times you can program an 84. Don McKenzie spam_OUTdonmckTakeThisOuTlabyrinth.net.au DonTronics Tullamarine, Australia http://www.labyrinth.net.au/~donmck EASY PIC'n Beginners Guide to using PIC 16/17 MicroChip products. Picosaurus(tm) 40 pin FED Basic with 8 channels of A-D, and real Uart. MEL PicBasic Compiler. Programmers from 15 USD. Pic-Axe(tm) A New Tool.

>Ok. I've been working with this one 16c84 for 200 cycles of build >->download ->place in circuit ->test. My question is how many times can you >rewrite the eeprom program memory? I'm having great results and learning >alot, then POOF, nothing works. Not even my first piece of pic code that >simply turns an ouput on. Is it me, or do I need a new PIC? Hi, I had some similar problems. It was nothing to do with the PIC memory, I just hadn't tied the MCLR pin up properly so it wasn't coming out of reset reliably. If the EEPROM verifies correctly (at the voltage you're running it on) it's ok and you should look at the rest of your board. Just my thoughts, Keith. ========================================================== Keith Dowsett "Variables won't; constants aren't." E-mail: .....kdowsettKILLspam@spam@rpms.ac.uk Phone: 0181-740-3162 Fax: 0181-743-3987 Snail mail: MRC Clinical Sciences Centre, Cyclotron Unit. Hammersmith Hospital. London W12 0NN.

>I too had a similar problem that was board related. I thought I had fried >the chip but found out that I had a wire that had come off. Big relief but >took lots of time to find. > >Norm > You want big relief? I accidentally plugged an 84 in backwards, into the programmer! So not only were the poor little pic's power lines were reversed, but RB7 had Vpp applied to it. Hmm, the programmer (PIP-02) said programming failed, so I tried it again. And again. Then I found that it was in backwards so I pulled it out to turn it around and it was a wee bit warm. It wouldn't program anymore. (I figured that the RB7 pin circuitry might be blown.) It didn't work for the next few days so I used one of my other 84s. But about a week later, I thought I'd try it once more before I threw it out, and it worked just fine! I guess it just needed a little R&R :) -- * Eddie Maste -- aa529KILLspamfreenet.durham.org