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ISO 9001 certified


embOS for National Semiconductor CR16C was developed for and with IAR's compiler and supports nearly all memory models offered by this compiler. It comes with an easy to use start project for IAR's embedded workbench. Software development with WinIdea debugger is supported.


Pricing Trial download Notification Subscribe to embOS software notification Release Notes


Resources and performance data

Memory usage
Kernel size (ROM) < 1800 bytes
Kernel RAM usage 40 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 16 bytes
RAM usage per software timer 14 bytes
RAM usage event 0 bytes
Min. stack-size per task (RAM) 28 bytes
Context switch time TBD
Interrupt latency time TBD
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


Board support packages

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

CPU Eval board
National Semiconductor CR16C CP3-DB-xx26-2 eval