einfach nochmal das Datenblatt zum Thema ISP lesen
HTHEven 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 Programming mode as shown in Table 127.
Code:Symbol Pins I/O Description MOSI (PDI) PE0 I Serial data in MISO (PDO) PE1 O Serial data out SCK PB1 I Serial clock