Zitat Zitat von Foooob
Kann ich den M103 Kompatibilitätsmodus beherzigt ausschalten oder hat das sonstige Folgen für IC, Schaltung oder Programmcode?
Kannst du einfach ausschalten wenn du keinen M103 ersetzen willst.
However,
some new features in ATmega128 are not available in this compatibility mode,
these features are listed below:
• One USART instead of two, Asynchronous mode only. Only the eight least
significant bits of the Baud Rate Register is available.
• One 16 bits Timer/Counter with two compare registers instead of two 16-bit
Timer/Counters with three compare registers.
• Two-wire serial interface is not supported.
• Port C is output only.
• Port G serves alternate functions only (not a general I/O port).
• Port F serves as digital input only in addition to analog input to the ADC.
• Boot Loader capabilities is not supported.
• It is not possible to adjust the frequency of the internal calibrated RC Oscillator.
• The External Memory Interface can not release any Address pins for general I/O,
neither configure different wait-states to different External Memory Address
sections.
In addition, there are some other minor differences to make it more compatible to
ATmega103:
• Only EXTRF and PORF exists in MCUCSR.
• Timed sequence not required for Watchdog Time-out change.
• External Interrupt pins 3 - 0 serve as level interrupt only.
• USART has no FIFO buffer, so data overrun comes earlier.
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