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ISO 9001 certified

embOS STM8 for IAR compiler

embOS for the ST STM8 series was developed for and with the IAR Embedded Workbench for STM8.
It comes with a ready to go start project for an STM8 CPU.
Software development with the ST-Link debugger tool and CSpy or CSpy simulator is supported.


Pricing Trial download Notification Subscribe to embOS software notification Release Notes


Resources and performance data

Memory usage
Kernel size (ROM) Approx. 1800 bytes
Kernel RAM usage 42 bytes
RAM usage per task control block 22 bytes
RAM usage per resource semaphore 7 bytes
RAM usage per counting semaphore 4 bytes
RAM usage per mailbox 11 bytes
RAM usage per software timer 9 bytes
RAM usage event 0 bytes
Min. stack-size per task (RAM) 32 bytes
Context switch time 23.0 µs
Interrupt latency time Zero
Kernel CPU usage/TICK Less than .2% of total calculation time at 1000 interrupts/second (1ms TICK)
Basic time unit (TICK) Typ. 1 ms, min. 50 µs (20 kHz interrupt frequency)
Max. no. of tasks Unlimited (by available RAM only)
Max. no. of mailboxes Unlimited (by available RAM only)
Max. no. of semaphores Unlimited (by available RAM only)
Max. no. of software timers Unlimited (by available RAM only)
Max. no. of priorities 255
Stack size idle task (RAM) 0 (no memory needed)
Nested interrupts Permitted
Task switches from within ISR Possible

Absolute values given above were measured with embOS release build on a CPU running at 16MHz.

Board support packages

embOS comes with lots of ready to go start projects and support packages for various STM8 CPUs and starterboards.

CPU Eval board