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RL78 Family

Chapter 3

EEL Functional Specifications

EEPROM Emulation Library Pack02

R01US0068EJ0100

Rev.1.00

Page 20 of 53

Mar. 28, 2014

[Overview of state transitions diagram]

To use EEL to manipulate the data flash memory, it is necessary to execute the provided functions in order to

advance the processing.

(1) uninitialized

This is the state after turning the power on or resetting.

(2) closed

This is the state in which the data to perform EEPROM emulation is initialized by executing the FDL_Init,

FDL_Open, and EEL_Init functions (no ongoing operation to the data flash memory).

To execute FSL, STOP mode, or HALT mode processing after executing EEPROM emulation, execute

EEL_Close in the opened state to switch to the closed state.

(3) opened

This state is switched to by executing EEL_Open in the closed state and makes it possible to perform

operations on the data flash memory. It is not possible to execute FSL, STOP mode, or HALT mode

processing until EEL_Close is executed and the system switches to the closed state.

(4) started

This state is switched to by executing the EEL_CMD_STARTUP command in the opened state and

makes it possible to execute EEPROM emulation. Writes and reads that use EEPROM emulation are

performed in this state.

(5)exhausted

This state is made from the opened or started state when continuously usable EEL blocks have been

exhausted during command execution. In this state, only EEL_CMD_READ, EEL_CMD_VERIFY, and

EEL_CMD_SHUTDOWN commands are executable.

(6) busy

This is the state used when executing a specified command. The state that is switched to differ

depending on which command is executed and how it terminates.

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