ich schaetze es ist wiedermal ein Fall von "wie finde ich Informationen in Datenblaettern Kapitel 428."
Even though the SPI Programming interface re-uses the SPI I/O module, there is one important
difference: The MOSI/MISO pins that are mapped to PB2 and PB3 in the SPI I/O module are not
used in the Programming interface. Instead, PE0 and PE1 are used for data in SPI Program-
ming mode as shown in Table 127.
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