RG14 datasheet(14/56 Pages) RENESAS

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RL78 Family

Chapter 2

EEPROM Emulation

EEPROM Emulation Library Pack02

R01US0068EJ0100

Rev.1.00

Page 14 of 53

Mar. 28, 2014

Between reference area and data area, there is an erased area. With each EEL data update (i.e. the data is

written), this area is reduced successively. However, at least two bytes of space always remain between reference

area and data area for management and separation of these areas. This is indicated by the separator in Figure 2-4.

The EEL block header is detailed in 2.3.4, EEL Block Header, while the structure of data stored in the reference

and data area are described in Section 2.3.5, Structure of Stored Data.

2. 3. 4

EEL Block Header

The structure of the block header is depicted in Figure 2-5. It is composed of eight bytes, four of which are

reserved for the system.

Figure 2-5

Structure of EEL block header

The block status flags start at the beginning of the block and include the A flag, B flag, I flag, and X flag, each of

which is one byte, for a total of 4 bytes of data. The combination of flags indicates the EEL block status.

Figure 2-5 shows the placement status of flags, and Table 2-3 shows the combination status of flags.

Table 2-3

Overviews of Block Status Flags

Block Status Flag

State

Description

A Flag

B Flag

I Flag

X Flag

0x01

0xFE

0xFF

Active

Currently used block

After the EEL_CMD_REFRESH command is executed,

the A flag of a new active block is set to 0x02.

0x02

0xFD

0xFF

Currently used block

After the EEL_CMD_REFRESH command is executed,

the A flag of a new active block is set to 0x03.

0x03

0xFC

0xFF

Currently used block

After the EEL_CMD_REFRESH command is executed,

the A flag of a new active block is set to 0x01.

Data other than

the above

0xFF

Invalid

Invalid block

other

than

0xFF

other

than

0xFF

Excluded

Excluded block

Reserved

0x00

Reserved

0xFF -　N

Reserved

0x0000

0x0001

0x0002

0x0003

0x0004

0x0005

0x0006

0x0007

relative byte

index within

block

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