embOS for RENESAS R32C was developed for and with RENESAS HEW compiler and supports all data memory models offered by this compiler.
embOS for R32C comes with an easy to use start project for an R32C CPU which may be used with the HEW.
Software development and debugging with E8a emulator as well as using the simulator is supported.

Resources and performance data

Memory usage
Kernel size (ROM)	approx. 1200 bytes
Kernel RAM usage	63 bytes
RAM usage per task control block	36 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)	64 bytes
Timing
Context switch time	438 clock cycles (9.1 µs), independent of number of tasks
Interrupt latency time	max. 186 clock cycles (3.9 µs)
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. 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	255
Stack size idle task (RAM)	0(no memory needed)
Nested interrupts	permitted
Task switches from within ISR	possible

Absolute data given above were measured with embOS release build on an R32C CPU running at 48MHz in NEAR data memory model.

embOSView offers system analysis during runtime

Available Emulators

• RENESAS E30A
• RENESAS E8a

Additional information

RENESAS Web site for additional CPU info / support

---

Release notes

1. Tool chain used for build
2. Performance
3. New features
4. Improvements
5. Program corrections
6. Known problems
7. Release history
8. Miscellaneous

Tool chain used for build

The following tools have been used:

Compiler:  RENESAS nc100  V1.01 Release 00
Assembler: RENESAS as100  V1.01.00
Librarian: RENESAS lb100  V1.00.01.000
Workbench: RENESAS HEW    4.04.01.001

Performance

1. Task switch time
   Near memory model: tbd
2. Interrupt latency, low priority interrupt
   Near memory model: tbd
3. Interrupt latency, high priority (zero latency) interrupt
   Near memory model: tbd

Absolute timings are based on an R32C running at 48 MHz and release build library

New features

Version 3.62c

1. Support for RSK32C111 evalboard
   embOS comes with a new sample start project for the RSK32C111 eval board which is setup to be used with the E8a emulator.
2. Initial version of embOS R32C for HEW
   Version 3.62c is the initial version of embOS for R32C and HEW, based on generic embOS sources V3.62c.

Improvements

Version 3.62c

1. None.
   Initial version based on embOS sources version 3.62c

Program corrections

Version 3.62c

1. None.
   Initial version based on embOS sources version 3.62c.

Known problems / restrictions

Version 3.62c

Current trial version of embOS for R32C does not support the near code model.

Release history

Version	Release date	Short explanation
V3.62c	18. Feb 2009	Initial version

Miscellaneous

This document was first released with version 3.62c of the software.
Software released earlier is documented internally. This information is available at request.