embOS for SH2 CPUs and HEW compiler

embOS for SH2 was developed for and with Renesas' HEW compiler.
It comes with a ready to go start project that runs on a RENESAS SH7086 eval kit.

Resources and performance data

Memory usage
Kernel size (ROM)	app. 4 Kbytes
Kernel RAM usage	51 bytes
RAM usage per task control block	32 bytes
RAM usage per resource semaphore	16 bytes
RAM usage per counting semaphore	8 bytes
RAM usage per mailbox	24 bytes
RAM usage per software timer	20 bytes
RAM usage event	0 bytes
Min. stack-size per task (RAM)	152 bytes
Timing
Context switch time	5.8 us @ 80MHz
Interrupt latency time	0
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. 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 values given above were measured with embOS release build on an RH2 CPU running at 80 MHz.

embOSView screenshot currently not available for SH2

Release Notes embOS SH2 for HEW4
RENESAS Web site for additional CPU info / support