ICSP (2) questions


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  1. #7
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    Quote Originally Posted by Ramonetnet View Post
    I am trying (without success, of course) to use ICSP, using Low Voltage.

    To help to make it work, would some sweet soul answer some of my questions ?

    a) can I use RS-232 to program a 18F452 ? What voltage is required ?

    I guess I can, as here there is a LVP

    >>> http://home.vrweb.de/~lotharstolz/st...vpc/index.html

    But I'd like to know the voltage required to make it work, as I have no success,
    and my WorkStation only provides 10 volts on the RS-232 interface ...

    b) can I program the 18f452 with the crystal installed ?

    I guess I can, as the final circuit has to have a crystal and I must be able to re-program it on the board, but I have read it is better not to have the crystal when programming.

    I am using MPASM and IC-PROG under XP. Thanks. Ramon.
    1. LVP is not that important unless the device under concern can't take 13V programming. BTW, LVP eats off one pin of Port B and you can't use it in your program anywhere.
    2. ICSP you need to momentarily disable few pins used otherwise for the circuit you design.
    regards to oscillator, many times PIC18xxxx uses internal oscillators. perhaps, then you need something called Vpp before Vdd facility. so that the circuit wont start and the device is taken to program mode.

    The best appears, PICKIT2. if you have time and patience to make few adopters, you don't need the other two parts you referred in your earlier post. Perhaps from spare components lying at home one can make these adopters. Incidentally, if money is nothing before the time lost, you may of course have them

    Please put your schematic here and let us see why you are not able to use ICSP facility, Ramon.
    Last edited by mvs_sarma; - 25th April 2008 at 06:02.
    Regards,
    Sarma

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