RH850 datasheet(18/66 Pages) RENESAS

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Data Flash Access Library - Type T01, European Release

Functional Specifications

R01US0079ED0103

User Manual

3.5 Suspend / Resume mechanism

Some Data Flash operations can last a long time especially multiple erase and write. The user application

cannot always wait for the operation end because other operations have higher priority. So, from user

point of view current operation is suspend-able and can be resumed after finishing the other Flash

accesses.

From software point of view an on-going operation always ends in suspended state unless the resume is

requested beforehand. In case the Flash hardware has already finished an operation but its end result

has not already been processed by the library, the library returns the suspended status. The final

operation result is returned after successful resume request.

The FDL contains special functions to suspend and resume an ongoing operation. Please refer to chapter

4.4.3.1 “R_FDL_SuspendRequest”.

Examples of Erase or Write Suspend-Resume flow:

Figure 6: Flash Access Rights

User Pool

EEL Pool

User Pool

Data Flash / FDL Pool

User Application

EEL

RH850 Datasheet(PDF) 18 Page - Renesas Technology Corp