64 KB flash, 8 KB RAM — what fits and what doesn't
The STM32F100V8T6B: The 64 KB program flash (64K x 8) and 8 KB SRAM (8K x 8) define the firmware envelope. A bare-metal UART-to-SPI bridge with a few ADC channels leaves about 20 KB flash and 4 KB RAM free after the HAL and startup code. Dropping in a full RTOS like FreeRTOS with a TCP/IP stack will consume most of the flash — budget the linker map before committing the BOM.
24 MHz Cortex-M3 — clock tree and interrupt latency
The ARM Cortex-M3 core runs at 24 MHz with a single-cycle multiply and a 12-cycle divide. Interrupt latency is 12 cycles from assertion to the first instruction of the handler, deterministic for hard real-time loops.
Supply and temperature — single-rail 3.3 V, industrial grade
The part is marked Active and ROHS3 compliant — no end-of-life notice or RoHS exemption expiry to track.
Package — 100-LQFP, 14x14 mm, 0.5 mm pitch
The exposed pad is not present — thermal dissipation relies on the lead frame and copper pours on the outer layers. 80 I/O lines are available for general-purpose or alternate functions.