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RL78 Family

Chapter 4

Using EEPROM Emulation

EEPROM Emulation Library Pack02

R01US0068EJ0100

Rev.1.00

Page 25 of 53

Mar. 28, 2014

Chapter 4 Using EEPROM Emulation

EEPROM emulation can store a maximum of 64

Note data items each consisting of 1 to 255 bytes in the flash

memory by using three or more blocks (recommended) of flash memory.

EEPROM emulation can be executed by incorporating the EEL into a user-created program and executing that

program.

Note: For details about the number of user data items that can be stored, see 4.2 Number of stored user data

items and total user data size.

4.1

Caution Points

EEPROM emulation is achieved by using a feature for manipulating the on-board microcontroller data flash

memory. Therefore, it is necessary to note the following

Table 4-1

Points for Caution (1/2)

Caution Points

All EEL codes and constants must be placed in the same 64-Kbyte flash block.

Initialization by the FDL_Init function must be performed before the FDL_Open, FDL_Close, or any EEL

function is executed.

The EEL must be initialized by the EEL_Init function before any EEL function is executed.

The data flash memory cannot be read during data flash memory operation by the EEL.

Do not execute STOP mode or HALT mode processing while the EEPROM emulation is being used.

If it is necessary to execute STOP mode or HALT mode processing, be sure to execute all of the

processing up to and including the EEL_Close function and FDL_Close function to finish EEPROM

emulation.

The watchdog timer does not stop during the execution of the EEL.

The request structure (eel_request_t) must be placed at an even address.

Do not destroy the request structure (eel_request_t) during command execution.

Initialize the argument (RAM) that is used by the EEPROM emulation library function. When not initialized,

a RAM parity error is detected and the RL78 microcontroller might be reset. For a RAM parity error, refer

to the user’s manual of the target RL78 microcontroller.

All members of the request structure (eel_request_t) must be initialized once before a command is

executed. If any unused member exists in the request structure (eel_request_t), set a desired value for the

member. If any member is not initialized, the RL78 microcontroller may be reset due to a RAM parity error.

For details, see the User’s Manual: Hardware for the RL78 microcontroller in use.

The EEL does not support multitask execution. Do not execute the EEL functions during interrupt

processing.

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