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ISO 9001 certified


embOS for M16C was developed for and with Renesas HEW Version 4 and the KPIT GCC Compiler v4.2. It comes with an easy to use sample start application.


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Resources and performance data

Memory usage
Kernel size (ROM) Approx. 1670 bytes
Kernel RAM usage 27 bytes
RAM usage per task control block 19 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) 42 bytes
Context switch time 439 clock cycles (27.4 µs), independent of number of tasks
Interrupt latency time Max. 182 clock cycles (11.4 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 (resource/binary/counting) 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 using an embOS Release build on a M30624 CPU running at 16MHz.