embOS for Renesas M16C80 / M32C CPUs and Renesas NC308 compiler

embOS for Renesas M16C80 / M32C was developed for and with Renesas NC308 compiler and supports all memory models offered by this compiler. It comes with easy to use start projects for Renesas HEW V4. Software development with PD308 debugger, KD308- or KD3083-ROM-Monitor, PD308 simulator or HEW M32C simulator is supported.

Resources and performance data

Memory usage
Kernel size (ROM)	1434 bytes
Kernel RAM usage	37 bytes
RAM usage per task control block	27 bytes
RAM usage per resource semaphore	6 bytes
RAM usage per counting semaphore	2 bytes
RAM usage per mailbox	13 bytes
RAM usage per software timer	13 bytes
RAM usage event	0 bytes
Min. stack-size per task (RAM)	50 bytes
Timing
Context switch time	416 clock cycles (20.8 µs), independent of number of tasks
Interrupt latency time	max. 164 clock cycles (8.2 µs)
Kernel CPU usage/TICK	less than .3% of total calculation time at 1000 Interrupts/second (1ms TICK)
Basic time unit (TICK)	typ. 1 ms, min. 10 µs (100 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 data given above were measured with embOS release build on an M30803FG CPU running at 20MHz in NEAR memory model.

embOSView offers system analysis during runtime

embOSView with Renesas M30833 CPU

Available Emulators

Renesas

Additional information

Release Notes embOS M32C for NC308 compiler
Renesas Web site for additional CPU / compiler info