25 MHz CPUXV2 core with 128 KB Flash
This is a mid-range density option in the F5xx line, sized for applications that need moderate code space and a rich peripheral set without stepping up to the larger 256 KB variants.
87 I/O and peripheral connectivity
With 87 general-purpose I/O pins brought out on the 100-LQFP package (14x14 mm body), this MCU can interface to a large number of external devices — parallel LCDs, multiple sensors, keypads, or memory chips — without needing an external GPIO expander. The I/O count is one of the highest in the 100-pin LQFP footprint for this family. The integrated DMA controller can move data between peripherals and memory without CPU intervention, which is useful when servicing multiple high-speed serial streams at 25 MHz.