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ISO 9001 certified

HCS12, CodeWarrior

embOS for Freescale HCs12 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 HCS12 starter boards is included.


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Resources and performance data

Memory usage
Kernel size (ROM) Approx. 2500 bytes
Kernel RAM usage 65 bytes
RAM usage per task control block 18 bytes
RAM usage per resource semaphore 4 bytes
RAM usage per counting semaphore 4 bytes
RAM usage per mailbox 12 bytes
RAM usage per software timer 12 bytes
RAM usage event 0 bytes
Min. stack-size per task (RAM) 64 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


Board support packages

embOS comes with lots of ready to go start projects and support packages for various HCS12 CPUs and starterboards.

CPU Eval board
Freescale MC9S12G128 MC9S12G128
Freescale MC9S12XEG128 MC9S12XEG128