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ISO 9001 certified


embOS for RENESAS H8/H8S series was developed for and with IAR's compiler and supports H8/H8S CPUs with all memory models offered by this compiler.
It comes with easy to use start projects for IAR's embedded workbench. Software development with CSpy simulator debugger is supported.


Pricing Trial download Notification Subscribe to embOS software notification Release Notes


Resources and performance data

Memory usage
Kernel size (ROM) 1582 bytes
Kernel RAM usage 34 bytes
RAM usage per task control block 28 bytes
RAM usage per resource semaphore 6 bytes
RAM usage per counting semaphore 2 bytes
RAM usage per mailbox 14 bytes
RAM usage per software timer 14 bytes
RAM usage event 0 bytes
Min. stack-size per task (RAM) 42 bytes
Context switch time 658 clock cycles (29.9 µs), independent of number of tasks
Interrupt latency time (Fast interrupt) Max. 74 clock cycles (3.3 µs)
Kernel CPU usage/TICK Less than .4% of total calculation time at 1000 interrupts/second (1ms TICK)
Basic time unit (TICK) Typ. 1 ms, min. 20 µs (50 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 timings given above were measured with embOS release build on an H83069 CPU running at 22 MHz in LARGE memory model.


Board support packages

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

CPU Eval board
Renesas H83069 Renesas H83069 evalboard
Renesas H8S2239 Renesas H8S2239 evalboard