RF12 datasheet(12/56 Pages) RENESAS

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RL78 Family

Chapter 2

EEPROM Emulation

EEPROM Emulation Library Pack02

R01US0068EJ0100

Rev.1.00

Page 12 of 53

Mar. 28, 2014

Figure 2-2 shows an exemplary pool configuration for a device with 8 KB data flash.

When no writable area is remaining in the active block (block 1 in the example) and data can no longer be stored

(failure in write command), a new active block is selected in a cyclic manner and the current valid data set is copied

to this new active block. This process is referred to as refresh. After the EEL_CMD_REFRESH command is

executed, the previous active block becomes invalid and only a single active block exists. Excluded blocks (like

block 7 in the example) are ignored during this process and not considered as candidates for the selection of the

next active block.

Figure 2-2

EEL pool structure

The overall life cycle of a block in the EEL pool is shown in Figure 2-3. During normal operation, the block

switches between active and invalid state. When an error occurs during an access to the EEL block, the error EEL

block is marked as excluded. This block will not enter the lifecycle again. However, the user can try to reanimate the

block by a format of the complete pool which also erases all existing data content.

Figure 2-3

Life cycle of an EEL block

invalid

block

active

block

excluded

block

format

physical

block

physical

block

physical

block

physical

block

physical

block

physical

block

physical

block

physical

block

EEL

block

Data Flash Memory

EEL pool

EEL

block

EEL

block

EEL

block

EEL

block

active block

invalid block

excluded block

EEL

block

EEL

block

EEL

block

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