XCP (or) “Universal Measurement and Calibration Protocol” is a network protocol originating In , the protocol was standardized as “ASAM MCD-1 XCP”. Refer to transport layer specific command 68 .. ASAM MCD 2MC AML for XCP (Common_Parameters). Like CCP, the “Universal Measurement and Calibration Protocol” (XCP) originated from the . Learn about the capabilities of the ASAM MCD-1 XCP standard.

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Many compilers discover this fact by code analysis and simply optimize the necessary RAM memory space away.

Essentially, the protocol supports all typical calibration tasks without the need to recompile to ECU application. The first version 1.

The programming commands are: Your personal copy will be sent to. The first letter X in XCP expresses the fact that the protocol is designed for a variety of bus systems.


Once the advanced time correlation features have been enabled, the XCP slave shall use the extended response formats for these messages. In this use case a specific connection between protocol handler and ECU exists. The XCP standard commands establish and mvd communication, identify the ECU implementation version checkunlock protected resources, obtain the current session state, and provide read access to the ECU memory.

Over the years, only extensions were added, which do not break the compatibility to earlier versions.


The A2L-file contains all the information necessary to access and correctly interpret the data that is transmitted via the XCP protocol. Our newsletter informs you when a new standard version is released.

The reason for this is that it could happen that the memory, which is the base for the calibration, is not completely located in the ECU or in the XCP slave.

Views Read Edit View history. Writing data into Flash requires precise knowledge of the ECU memory layout. Along with three basic techniques, advanced time correlation offers all mcf features needed to improve xcl synchronization significantly. Based on this technique, the XCP master is aware of the relation between clocks of the XCP slave, and finally is able to perform precise clock correlation within the XCP master.

It is not necessary to change the ECU control algorithm implementation because it uses logical addresses to access parameters.

The standard includes the following deliverables: With introduction of the advanced time correlation technique, XCP nodes are aware of time synchronization carried out through well-established, XCP unrelated standards.

Because the A2L format file contains all the information to access the information, the ECU code does not have to be recompiled to access different measurements or calibrations. It was designed for use aasm the automotive industry, primarily for asa, areas of ECU development, calibration and testing.

If it switches a memory segment from a Flash page to a RAM page, a parameter located in this memory segment can be adjusted during the execution of the control algorithm, also known aasm online calibration. Free of charge for members.


This information is required to handle systems with more than one grandmaster clock. This means that access to a specific parameter does not need to be hardcoded into the ECU application.

XCP (protocol) – Wikipedia

The generation of the XCP master initiated event that has to occur simultaneously at the XCP slaves requires broadcast-like mechanism. Typically, the inputs of the bypass function are identical to the inputs of the original function. This description allows memory-type specific access. The frame consists of three parts: Flashing means writing data into an area of flash memory.


mfd The primary purpose of XCP is to adjust internal parameters and acquire the current values of internal variables of an ECU. A typical task is the configuration of data acquisition. In addition to supporting other transport layers, the successor to the CCP protocol contains many functional improvements such as: Entire datasets can be acquired or stimulated synchronous to events triggered by timers or operating conditions.

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