embOS for NEC V850 CPUs and Green Hills compiler

embOS for NEC V850 was developed for and with Green Hills compiler and supports all memory models offered by this compiler. It comes in two versions with an easy to use start project for Green Hills Multi 1.8.9 and Multi 2000 embedded workbench. Software development with debugger and simulator is supported.

Resources and performance data

Memory usage
Kernel size (ROM)	1708 bytes
Kernel RAM usage	41 bytes
RAM usage per task control block	32 bytes
RAM usage per resource semaphore	8 bytes
RAM usage per counting semaphore	8 bytes
RAM usage per mailbox	20 bytes
RAM usage per software timer	20 bytes
RAM usage event	0 bytes
Min. stack-size per task (RAM)	256 bytes
Timing
Context switch time	max. 192 clock cycles (6 µs), independent of number of tasks
Interrupt latency time	max. 64 clock cycles (2 µs)
Kernel CPU usage/TICK	less than .15% 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	256
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 V850EMS1 CPU running at 32MHz.

embOSView offers system analysis during runtime

embOSView with NEC V850EMS1

Available Emulators

Additional information

Release Notes embOS V850 for GHS Multi 1.8.9 compiler
Release Notes embOS V850 for GHS Multi 2000 compiler
Green Hills Web site for additional compiler info / support