That FPU matters for sensor-fusion math or PID loops that would otherwise eat CPU cycles in software.
The 64-LQFP package (10x10 mm body) has 49 I/O. Supply range is 1.08 V to 3.63 V. Internal oscillator is on-die.
What the key ratings drive in the design
The 80 MHz core speed sets the timing budget for CAN message processing and ADC sampling. With a 12-bit ADC (12 channels) and a DMA controller, the part can sample analog inputs without CPU intervention — useful for reading multiple potentiometers or current-sense resistors in a motor drive. The 49 I/O count in a 64-LQFP leaves room for a parallel LCD data bus or a bank of optocoupler inputs while still having serial lines free.