The STM8S001J3 8-bit microcontrollers offer 8 Kbytes of Flash program memory, plus integrated true data EEPROM. It is referred to as low-density device in the STM8S microcontroller family reference manual (RM0016).The STM8S001J3 device provides the following benefits: performance, robustness and reduced system cost.

Clock, reset and supply management
Flexible clock control, 3 master clock sources
External clock input
Internal, user-trimmable 16 MHz RC
Internal low-power 128 kHz RC
Clock security system with clock monitor
Power management
Low-power modes (wait, active-halt, halt)
Switch-off peripheral clocks individually
Permanently active, low-consumption power-on and power-down reset
Interrupt management
Nested interrupt controller with 32 interrupts
Up to 5 external interrupts
Timers