DVA18XP180 Microchip Technology, DVA18XP180 Datasheet - Page 21

• Manufacturer Part Number: DVA18XP180
• Description: DEVICE ADAPTER 18F1320 PDIP 18LD
• Manufacturer: Microchip Technology

Specifications of DVA18XP180

• Module/board Type: *
• Accessory Type: Device Adapter
• Peak Reflow Compatible (260 C): Yes
• Pitch Spacing: 2.54mm
• Kit Contents: Device Adapter
• Convert To: MPLAB ICE 2000
• For Use With: PCM18XJ1 - MODULE PROC PIC18F1320,1220
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With/related Products: ICE2000
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

CMX-RTX™ for dsPIC30F Devices
In some cases, well-structured linear programming is
sufficient for a product. In most cases, however,
programmers appreciate not having to worry about
structuring their code to perform all necessary tasks in
a timely manner. This is where CMX-RTX can help.
CMX-RTX allows tasks (pieces of code that do specific
duties) to run quasi-concurrently. This means that tasks
will seem to run all at the same time – doing many
specific jobs simultaneously.
CMX-RTX takes the worry and headaches out of real
time programming. The software lets embedded
programmers concentrate on the overall application as
it takes care of the little details. Finish projects faster
and more efficiently with CMX-RTX.
Some RTOS software offers only cooperative
scheduling, which means that the running task has to
call the scheduler to perform a task switch. Others offer
time slicing where each task runs for a certain period of
time, at which point a task switch takes place no matter
what. Others claim to be fully preemptive, but do not
allow any interrupt to cause a preemption. All of these
models will fail at one point or another.
CMX-RTX allows a task of higher priority that is able to
run (whether starting or resuming) to preempt the lower
priority running task. This will cause the scheduler to
save the context of the running (lower priority) task and
restore the context of the higher priority task so that it is
now running. A truly preemptive RTOS allows interrupts
to cause an immediate task switch. This means that the
interrupts now have the added ability of using the
RTOS's functions.
 2004 Microchip Technology Inc.
Ordering Information:
SW300031
DS51435
CMX-RTX™ for dsPIC30F Devices
CMX-RTX™ for dsPIC30F Devices Sell Sheet (Available at: www.microchip.com)
Features
CMX-RTX Specifications for
dsPIC
Flash
• The smallest footprint
• The fastest context switch times
• The lowest interrupt latency times
• True preemption
• Scheduler and interrupt handler written in
• Optional co-operative and time-slicing scheduling
• Nested interrupts
• All functions contained in a library
• Interrupt callable functions
• Scalability
• Free source code provided
• Integrated with CMX-MicroNet™ for optional
• All CMX Functions: 3696 bytes
• CMX Initialize Module: 936 bytes
• CMX Assembly Module (scheduler): 645 bytes
• RAM, Each Task Control Block: 28 bytes
• Min. Context Switch:
• CMX functions are contained in a library, thus
Assembly for speed and optimization
networking connectivity
reducing code size, if not referenced.
- 92 cycles (starting a task)
- 137 cycles (resuming a task)
®
DSC Products
Software Tools
DS30177S-page 19