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RL78 Family

Chapter 4

Using EEPROM Emulation

EEPROM Emulation Library Pack02

R01US0068EJ0100

Rev.1.00

Page 26 of 53

Mar. 28, 2014

Table 4-2

Points for Caution (1/2)

Caution Points

After the FDL_Close and EEL_Close functions have been executed, the requested command and ongoing

command stop and cannot be resumed. Before calling the FDL_Close and EEL_Close functions, finish all

ongoing commands.

Before using the EEPROM emulation library, always close the FSL. Also, do not run the FSL while the

EEPROM emulation library is being used. When using the FSL, be sure to execute all of the processing up

to and including the EEL_Close function and FDL_Close function to finish EEPROM emulation.

When using EEPROM emulation after executing FSL processing, it is necessary to start processing from

the initializing function (the FDL_Init function).

Before starting the EEPROM emulation, be sure to start up the high-speed on-chip oscillator first. The

high-speed on-chip oscillator must also be activated when using the external clock.

In address above 0xFFE20 (0xFE20), do not place data buffer (argument) or stack which is used by

EEL functions and FDL functions.

When using data transfer controller (DTC) during EEPROM emulation, do not place RAM area used by

DTC in self-RAM and in address above 0xFFE20 (0xFE20).

Until EEPROM emulation is finished, do not corrupt RAM area (including self-RAM) used by EEPROM

emulation.

No checksum is added to user data. If a checksum is needed, add it to user data and check through the

user program.

When the FDL descriptor or EEL descriptor is changed, the EEPROM emulation can no longer be

executed. In that case, the EEL pool must be formatted by the EEL_CMD_FORMAT command in addition

to initialization of FDL and EEL. When adding data, however, the EEPROM emulation can be continuously

executed.

Do not operate the Data Flash Control Register (DFLCTL) during the execution of the EEL.

use

the

data

flash

memory

for

EEPROM

emulation,

necessary

execute

the

EEL_CMD_FORMAT command upon first starting up to initialize the data flash memory and make it

usable as EEPROM emulation blocks.

It is recommended that at least three blocks be provided in the data flash memory to use the EEL.

Do not destroy EEL blocks by the user program that uses other EELs or FDLs.

The EEL does not support multitask execution. When executing an EEL function on the OS, do not

execute in from two or more tasks.

About an operation frequency of RL78 microcontrollers and an operation frequency value set by the

initializing function (FDL_Init), be aware of the following points:

-When using a frequency lower than 4 MHz as an operation frequency of RL78 microcontrollers, only 1

MHz, 2 MHz and 3 MHz can be used (frequencies other than integer values like a 1.5 MHz cannot be

used). Also, set an integer value 1, 2, or 3 to the operation frequency value set by the initializingfunction.

- When using a frequency of 4 MHz or higher

Note1 as an operation frequency of RL78 microcontrollers, a

certain frequency can be used as an operation frequency of RL78 microcontrollers.

- This operation frequency is not the frequency of the high-speed on-chip oscillator.

Note 1: For a maximum frequency, see the target RL78 microcontroller user’s manual.

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