Zitat Zitat von darwin.nuernberg
  • PAGE 7: PEN is a programming enable pin for the SPI Serial Programming mode, and is internally
    pulled high . By holding this pin low during a Power-on Reset, the device will enter
    the SPI Serial Programming mode. PEN has no function during normal operation.


    TABLE 106: Programming enable (observe only)

    PAGE 304: As an alternative to using the RESET signal, PEN can be held low during Poweron
    Reset while SCK is set to “0”. In this case, only the PEN value at Power-on
    Reset is important. If the Programmer cannot guarantee that SCK is held low
    during power-up, the PEN method cannot be used. The device must be powered
    down in order to commence normal operation when using this method.
Naja wenn ich das richtig verstehe, kann man auch den SPI fürs ISP nutzen, muß dann aber anstatt des Reset-Pins den PEN verwenden. - Allerdigs geht das Proggen dann nur beim Poweronreset, und der Progger muß den SCK auch einen Moment auf 0-Pegel halten können... Hab ich das jetzt richtig interpretiert?