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RL78 Family

Chapter 2

EEPROM Emulation

EEPROM Emulation Library Pack02

R01US0068EJ0100

Rev.1.00

Page 13 of 53

Mar. 28, 2014

The EEL pool has the four states shown below.

Table 2-1

States of the EEL Pool

State

Description

Pool operational

This is the usual case during EEL operation. All commands are available and can be executed.

Pool full

Free space for data write is insufficient in the active block in use. This state indicates that a

refresh needs to be executed.

Pool exhausted

No continuously usable EEL block is left. (At least two blocks that are not excluded are

necessary for EEL operations.)

Pool inconsistent

There is a mismatch in the pool state and the data structure in the EEL block does not match

the user-set data structure. The EEL block is in the undefined state (e.g. no active block is

present).

2. 3. 3

Structure of EEL Block

The detailed block structure used by the EEL is depicted in Figure 2-4. In general, an EEL block is divided into three

utilized areas: the block header, the reference area and the data area.

Figure 2-4

ELL Block Structure (Example of RL78/G13 Data Flash Block 0)

Table 2-2

Configuration of Each EEL Block

Name

Description

block header

The block header contains all block status information needed for the block management

within the EEL-pool. It has a fixed size of 8 bytes.

reference area

The reference area contains reference data which are required for the management of

data. When data is written, this area extends in the address increment direction.

data area

The data area contains user data. When data is written, this area extends in the address

decrement direction.

block header

reference area

separator (erased 2 bytes)

erased area

(all bytes 0xFF)

data area

0xF1000

0xF13FF

growing

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