embOS for Renesas M16C6x / M16C20 CPUs and IAR compiler

embOS for Renesas M16C6x / M16C20 was developed for and with IAR's compiler V3.21A and supports all memory models offered by this compiler. It comes with an easy to use start project for IAR's embedded workbench. Software development with debugger, ROM-Monitor and CSpy simulator is supported.

A version for the older IAR compiler version V3.20A is available on request. Please refer to release notes below.

Resources and performance data

Memory usage
Kernel size (ROM)	1281 bytes
Kernel RAM usage	28 bytes
RAM usage per task control block	18 bytes
RAM usage per resource semaphore	4 bytes
RAM usage per counting semaphore	2 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)	42 bytes
Timing
Context switch time	346 clock cycles (21.6 µs), independent of number of tasks
Interrupt latency time	max. 122 clock cycles (7.6 µs)
Kernel CPU usage/TICK	less than .4% 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 timings given above were measured with embOS release build on an MB30624 CPU running at 16MHz in NEAR memory model.

embOSView offers system analysis during runtime

embOSView with Renesas M16C/62 CPU

Available Emulators

Renesas
HP

Additional information

Release Notes embOS M16C for IAR compiler
IAR Web site for additional compiler info / support
Renesas Web site for additional CPU info / support

Copyright 2001-2007 SEGGER Microcontroller GmbH & Co.KG. All rights reserved.
For more information, please visit our web site www.segger.com or contact us at info@segger.com
Last update: December 7, 2007