Method for accessing data in external memory of microcontroller

Abstract

The invention relates to a method for accessing data in an external memory of a microcontroller, wherein the microcontroller comprises an internal memory. The method includes: providing a classification data set in an internal memory, where the classification data set includes a segment data classification for each segment of data stored in an external memory in segments, the segment data classification characterizing the data stored in the respective segment; and a read access in which data is read from the external memory corresponding to the predetermined data classification. The read access comprises checking a segment to be checked, in which a segment data classification of the segment to be checked is read from the internal memory and compared to a predetermined data classification during the checking, and if the read segment data classification corresponds to the predetermined data classification, data stored in the segment to be checked is read from the external memory, and if the read segment data classification corresponds to the predetermined data classification, data stored in the segment to be checked is read from the external memory. Alternatively, if the read segment data classification does not correspond to the predetermined data classification, the step of checking other segments that have not been checked is continued.

Description

technical field [0001] The invention relates to a method for accessing data in an external memory of a microcontroller, as well as a computing unit and a computer program for carrying out said method. Background technique [0002] In embedded systems such as control devices of machines or vehicles microcontrollers are used which, in addition to one or more processor cores, have a specific limited amount of internal working memory in which the A program to be executed and data used by the program during said execution. [0003] A typical SRAM memory cell used as a working memory in a microcontroller includes multiple transistors and is correspondingly relatively expensive and complex to manufacture, so the working memory integrated in said microcontroller is usually only large enough for basic applications or Used by the data used by the basic application. For cost reasons, an internal expandability of the working memory is generally not provided or not possible in the case...

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Problems solved by technology

[0003] A typical SRAM memory cell used as a working memory in a microcontroller includes multiple transistors and is correspondingly relatively expensive and complex to manufacture, so the working memory integrated in said microcontroller is usually only large enough for basic applications or The data used by the basic application is used by

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