8HC08M68HC datasheet(94/454 Pages) MOTOROLA

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Technical Data

MC68HC908AS60 — Rev. 1.0

EEPROM-1

MOTOROLA

EEPROM-1

6.4.3 EEPROM Block Protection

The 512 bytes of EEPROM are divided into four 128-byte blocks. Each

of these blocks can be separately protected by EEBPx bit. Any attempt

to program or erase memory locations within the protected block will not

allow the program/erase voltage to be applied to the array. Table 6-2

shows the address ranges within the blocks.

If EEBPx bit is set, that corresponding address block is protected. These

bits are effective after a reset or a read to EENVR1 register. The block

protect configuration can be modified by erasing/programming the

corresponding bits in the EENVR1 register and then reading the

EENVR1 register.

In redundant mode, EEBP3 and EEBP2 will have no meaning.

6.4.4 EEPROM Redundant Mode

To extend the EEPROM data retention, the array can be placed in

redundant mode. In this mode, the first 256 bytes of user EEPROM array

are mapped to the last 256 bytes. Reading, programming, and erasing

of the first 256 EEPROM bytes will physically affect two bytes of

EEPROM. Addressing the last 256 bytes will not be recognized. Block

protection still applies but EEBP3 and EEBP2 are meaningless.

NOTE:

Programming the EEPROM in non-redundant mode and programming

the data to its corresponding location before entering redundant mode is

recommended.

Table 6-2. EEPROM Array Address Blocks

Block Number (EEBPx)

Address Range

EEBP0

$0800–$087F

EEBP1

$0880–$08FF

EEBP2

$0900–$097F

EEBP3

$0980–$09FF

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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