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ISO 9001 certified

78K0/K0S/K0R, IAR

embOS for NEC 78K0 / K0S / K0R series was developed for and with IAR's compiler. For K0 / K0S CPU, the small memory model ist supported.
For K0R CPUs, all combinations of code / data model are supported. embOS for K0 comes with with easy to use start projects for IAR's embedded workbench. Software development with NEC debugger or simulator is supported.


Pricing Trial download Notification Subscribe to embOS software notification Release Notes


Resources and performance data

Memory usage
Kernel size (ROM) 1400 bytes
Kernel RAM usage 31 bytes
RAM usage per task control block 12 bytes
RAM usage per resource semaphore 8 bytes
RAM usage per counting semaphore 4 bytes
RAM usage per mailbox 12 bytes
RAM usage per software timer 10 bytes
RAM usage event 0 bytes
Min. stack-size per task (RAM) 120 bytes
Context switch time 10.3 µs, independent of number of tasks
Interrupt latency time TBD
Kernel CPU usage/TICK Less than 1% of total calculation time at 1000 interrupts/second (1ms TICK)
Basic time unit (TICK) Typ. 1 ms, min. 100 µs (10 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 XRelease build on an 78K0R CPU running at 20MHz.


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 K0 78F0066 NEC 78K0 Test It!
Renesas K0 78F0148 NEC 78K0 Play It!
Renesas K0R 78F1166 NECs 78K0R Cool it!