embOS for Renesas M16C6x / M16C20 / R8C CPUs and Tasking compiler

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 simulator is supported.

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
Timing
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)
Features
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 timings given above were measured with embOS release build on an M30624 CPU running at 16MHz in SMALL memory model.

embOSView offers system analysis during runtime

embOSView with Renesas M30624 CPU

Available Emulators

Renesas
HP

Additional information

Release Notes embOS M16C for Tasking compiler
Tasking Web site for additional compiler info / support
Renesas Web site for additional CPU info / support