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ISO 9001 certified

M16C/R8C, Tasking

embOS for Renesas M16C6x / M16C20 / R8C was developed for and with Tasking compiler and supports all memory models offered by this compiler. It comes with easy to use start projects for Tasking's EDE. Software development with Crossview Pro and Crossview Pro simulator is supported.


Pricing Trial download Notification Subscribe to embOS software notification Release Notes


Resources and performance data

Memory usage
Kernel size (ROM) 1680 bytes
Kernel RAM usage 29 bytes
RAM usage per task control block 17 bytes
RAM usage per resource semaphore 4 bytes
RAM usage per counting semaphore 2 bytes
RAM usage per mailbox 11 bytes
RAM usage per software timer 11 bytes
RAM usage event 0 bytes
Min. stack-size per task (RAM) 40 bytes
Context switch time 342 clock cycles (21.3 µs), independent of number of tasks
Interrupt latency time Max. 158 clock cycles (9.9 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 M30624 CPU running at 16MHz in SMALL 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 M30624 Renesas M30624 evalboard