RX850

   The RX850 Pro has the following features.
` Conformity with ITRON3.0 specification
   As a representative embedded type control OS architecture, the RX850 Pro performs design which is
   compatible with ITRON3.0 specifications, and includes all the functions up to level E.
   The ITRON3.0 specification applies to an embedded, real-time control OS.
` High flexibility
   The RX850 Pro supports system-specific system calls (7 types), as well as those defined in the ITRON3.0
   specification (67 types). The RX850 Pro thus offers superior application system flexibility.
   The RX850 Pro can be used to create a real-time, multitask OS that is compact and that can satisfy the
   user's needs because the functions (system calls) to be used by the application system can be selected at
   system construction.
` Realization of real-time processing and multitasking
   The RX850 Pro supports the following functions to realize complete real-time processing and multitasking.
   Task management function
   Task-associated synchronization function
   Synchronous communication function
   Interrupt management function
   Memory pool management function
   Time management function
   System management function
   Scheduling function
` Scheduling lock function
   The RX850 Pro supports a function to disable/resume dispatch processing (task scheduling processing).
   This function enables users to disable/resume dispatch processing from the processing program level.
` ROMization
   The RX850 Pro is a real-time, multitask OS that has been designed on the assumption that it will be
   incorporated into the target system, and has been made as compact as possible to enable it to be loaded into
   a system's ROM.
` Use of original instructions
   The RX850 Pro realizes high-speed processing through the high-speed instruction execution of the V850
   Series microcontrollers and by using original instructions.
` Use of internal ROM/RAM
   The RX850 Pro realizes high-speed instruction execution and high-speed data access by using the V850
   Series internal ROM and RAM.
` Application utility support
   The RX850 Pro supports the following two utilities to aid in application system construction.
   Configurator CF850 Pro
   High-level language interface library
` C compiler
   The RX850 Pro supports the following C compilers for the V850 Series.
   CA850 (NEC Electronics)
  CCV850 (Green Hills SoftwareTM, Inc.)

Rapid advances in semiconductor technologies have led to the explosive spread of microprocessors, to the extent that they are now to be found in more fields than many would have imagined only a few years ago. In line with this spread, the number of processing programs that must be created for ever-newer high-performance, multi-function microprocessors is also increasing. This rule of growth makes it difficult to create processing programs specific to
given hardware.

For this reason, there is a need for operating systems (OSs) that can fully exploit the capabilities of the latest generation of microprocessors.

Operating systems of RX850 are broadly classified into two types: program-development OSs and control OSs. Programdevelopment OSs are to be found in those environments in which standard OSs (e.g., MS-DOS , Windows, and UNIXTM OS) predominate because the hardware configuration to be used for development can be limited to some extent (e.g., personal computers).

Conversely, control OSs are incorporated into control units. That is, these OSs are found in those environments where standard OSs cannot easily be applied because the hardware configuration varies from system to system and because efficient operation matching the application is required.

In order to adequately exploit the functions of the V850 Series of high-performance microcontrollers, developed in
consideration of the current market conditions, as well as support the creation of more systematic software, NEC
Electronics has now released the RX850 Pro.

The RX850 Pro is a control OS for real-time, multitask processing that it has been developed to increase the
application range of high-performance, multi-function microcontrollers and further improve their flexibility.