emWin upgrade     Trade-In program     Web shop
Flag icon Head office Germany
Flag icon US office

ISO 9001 certified


embOS for RENESAS H8/H8S/H8SX series was developed for and with Renesas's HEW compiler and supports H8/H8S/H8SX CPUs with all memory models offered by this compiler.
It comes with easy to use start projects for HEW workbench. Software development with Renesas debugger tools 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 14 bytes
RAM usage per counting semaphore 6 bytes
RAM usage per mailbox 14 bytes
RAM usage per software timer 16 bytes
RAM usage event 0 bytes
Min. stack-size per task (RAM) 42 bytes
Context switch time 402 clock cycles (13.8 µs), independent of number of tasks
Interrupt latency time (Fast interrupt) Max. 55 clock cycles (1.9 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 H8S2378 CPU running at 29.5 MHz.

Board support packages

embOS comes with lots of ready to go start projects and support packages for various H8/H8S/H8SX CPUs and starterboards.

CPU Eval board
Renesas H8SX1668R MSC VisuRDKH8SX1668R
Renesas H8S2215R Renesas RSKH8S2215R
Renesas H8S2378 Renesas RSKH8S2378
Renesas H8S2456 Renesas RSKH8S2456
Renesas H8S2472 Renesas RSKH8S2472
Renesas H8SX1664F Renesas RSKH8SX1664F
Renesas H8SX1668R Renesas RSKH8SX1668R