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ISO 9001 certified

embOS for Freescale SO8 and CodeWarrior

embOS for Freescale SO8 was developed for and with CodeWarrior compiler and supports all memory models offered by these compilers. It comes with easy to use start projects for CodeWarrior workbench. Initilization code for different Freescale SO8 starter boards is included.


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Resources and performance data

Memory usage
Kernel size (ROM) Approx. 1700 bytes
Kernel RAM usage 65 bytes
RAM usage per task control block 20 bytes
RAM usage per resource semaphore 7 bytes
RAM usage per counting semaphore 4 bytes
RAM usage per mailbox 11 bytes
RAM usage per software timer 9 bytes
RAM usage event 0 bytes
Min. stack-size per task (RAM) 20 bytes
Context switch time TBD
Interrupt latency time Zero
Kernel CPU usage/TICK Less than .2% of total calculation time at 1000 Interrupts/second (1ms TICK)
Basic time unit (TICK) Typ. 1 ms, min. 20 µs (50 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 values given above were measured with embOS release build on an Freescale SO8 M68908GB60 running at 40MHz.

Board support packages

embOS comes with lots of ready to go start projects and support packages for various SO8 CPUs and starterboards.

CPU Eval board
Freescale M68908GB60 Axiom M68DEMO908GB60