What the STM8S207R8T3 brings to an 8-bit control design
The STM8S207R8T3 is an 8-bit microcontroller from ST's STM8S series, built around the STM8 core and clocked at 24 MHz.
At 24 MHz, the STM8 pipeline executes most instructions in a single clock cycle, giving a throughput of roughly 24 MIPS. That is enough headroom for a 20 kHz PWM loop with a few hundred microseconds left for communications and housekeeping.
Memory sizing: Flash, RAM, and EEPROM
64 KB of Flash is sized for mid-complexity firmware — bootloader, application code, and a modest parameter table. The 6 KB RAM handles a few communication buffers and a stack for nested interrupts without overflow. The 1.5 KB EEPROM is useful for calibration constants and fault logs that survive power loss, avoiding the need for an external serial EEPROM.
ST lists the STM8S207R8T3 as Active. For production programs that need a stable 8-bit MCU through the next several years, this is a safe choice without the supply-chain gymnastics of an EOL part.