Datasheet PDF of 3.36 MB covering the mega16, mega32 and mega64 M1 variants, matching the Atmel AVR ATmega16M1/32M1/64M1 family aimed at automotive and motor control use with CAN and LIN support. These differ from the plain ATmega16, 32 and 64, so confirm the M1 suffix on the chip marking. The document should cover pinout, CAN controller, PSC, ADC, electrical characteristics and programming, useful for tracing bus lines and connecting a programmer correctly.
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