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Hi, I'm using the Tait Flash PIC Programmer and "Classic"
interface, I can program a 16F877 but not a 16F877A, what is the difference between both? I can read, erase but not Write the 16F877A. With the 16F877 everything works OK. I try changing the differents software delays but I can not program the 16F877A |
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16F877 programing Vs 16F877A
Started by ●July 25, 2003
Reply by ●July 25, 20032003-07-25
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There is a HUGE difference in the programming algorithm. You can get the details from Microchip but basically the 'A' version is programmed 4 words at a time versus 1 word for the original. Unless your programmer is known to be capable of doing the 'A' version, you need to reconsider either the device or the programmer. --- In , fjch100 <no_reply@y...> wrote: > Hi, I'm using the Tait Flash PIC Programmer and "Classic" interface, > I can program a 16F877 but not a 16F877A, what is the difference > between both? > > I can read, erase but not Write the 16F877A. With the 16F877 > everything works OK. I try changing the differents software delays > but I can not program the 16F877A |
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Reply by ●July 25, 20032003-07-25
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> There is a HUGE difference in the programming algorithm. You can get
> the details from Microchip but basically the 'A' version is > programmed 4 words at a time versus 1 word for the original. > > Unless your programmer is known to be capable of doing the 'A' > version, you need to reconsider either the device or the programmer. Agreed with the above, and I add: The *read* algorithm for all 14-bit PICs is the same, so the fact that you can read (using a 16F877 algorithm) does not imply that you can also write (or erase). Unless your programmer and/or PC software explicitly mention the 16F87xA you should not expect to be able to use this chip. Wouter van Ooijen -- ------- Van Ooijen Technische Informatica: www.voti.nl consultancy, development, PICmicro products |
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Reply by ●July 26, 20032003-07-26
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--- In , "Wouter van Ooijen" <wouter@v...> wrote: > > There is a HUGE difference in the programming algorithm. You can get > > the details from Microchip but basically the 'A' version is > > programmed 4 words at a time versus 1 word for the original. > > > > Unless your programmer is known to be capable of doing the 'A' > > version, you need to reconsider either the device or the programmer. I have to disagree with the above statement. It is the programming software, not the hardware that cares about the programming algorythm. Unless you are doing low-voltage programming, which I do not believe the original poster is doing since he mentioned measuring /MCLR at 12.68 volts, the programmer doesn't care if you are writing to a 16F877 or 16F877A |
