CEB-V850/SA1 Renesas Electronics America, CEB-V850/SA1 Datasheet - Page 32

• Manufacturer Part Number: CEB-V850/SA1
• Description: KIT DEV TOOL V850 SA1 UPD70F3017
• Manufacturer: Renesas Electronics America

Specifications of CEB-V850/SA1

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

REAL-TIME OS
RX850, RX850 Pro
30
Why is a real-time OS needed?
With the recent advances in the performance and functionality of microcontrollers, not only have the systems to be developed become more
complex, but also the quantity of the programs to be executed by these systems has increased. Because systems in the field of control
equipment in particular are required to respond immediately to changes in external and internal events, many problems that cannot be
solved by conventional interrupt servicing have arisen; hence the development of the real-time OS.
The real-time OS is designed to react promptly to event changes and interrupts and manages multiple processing programs by dividing
them into task units, which are then executed in the optimal order.
Conventional program
The V850 Series real-time OSs have been designed as the natural successors of the 16-bit V Series and 78K Series real-time OSs.
They offer the following high-performance environment.
RX850
RX850 Pro
Real-Time OS
Compliance with industry standards (ITRON, ITRON specifications)
Support for power management functions
Capability to embed required functions only (selection of system calls to be used)
Advanced task development support through task debugger (RD)
Application operational analysis support through system performance analyzer (AZ)
A-1
A-2
A-3
Specification
ITRON3
ITRON3
The following real-time OSs are supported in the V850 Series.
Task execution
control
Task A
[Conditions]
· V853 (25 MHz)
· Program:
· Data/stack: Internal RAM
[Conditions]
· V850E/MA1 (50 MHz)
· Program:
· Data/stack: Internal RAM
Maximum interrupt disable time: 7 s
Task switching time:
Code size:
Maximum interrupt disable time: 8 s
Task switching time:
Code size:
Real-time OS
management
RX850:
RX850 Pro: Real-time OS for V850 Series
Internal ROM
External ROM
(external bus width: 16 bits/2 waits)
Interrupt
Task B
Real-time OS
Performance
management
Pamphlet U15763EJ5V0PF
Memory
Real-time OS for V850 Series
Task C
11 s (wup_tsk)
3 to 7 KB
20 s (wup_tsk)
5 to 13 KB
Real-time OS advantages
<For designing>
<For debugging>
<For program maintenance>
Specification changes and function additions can be executed in
Facilitates creation of application modules
Software development can be focused solely on the application
Management of program in task units
Tasks can be set individually by prescribing an inter-task com-
munication mode
simultaneously
Only inter-task communication and synchronization testing are
required for integrated debugging
task units, reducing the effect on the system as a whole
Because the program consists of task units:
Discrete task debugging enables multiple operators to debug
The program can be reused in task units, even in other sys-
The internal structure is simplified, resulting in greater pro-
gram legibility
tems
This OS is easy to port from the 78 K Series. It has a compact
design to enable operation from the on-chip ROM and RAM of
the V850.
This is the RX850 OS but with enhanced functions.
Description