MC68HC08AZ60 Datasheet, PDF(57/452 Page) Motorola, Inc – Advance Information

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MC68HC08AZ60 Datasheet, PDF (57/452 Pages) Motorola, Inc – Advance Information

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EEPROM Erasing

5-eeprom-2

MOTOROLA

Freescale Semiconductor, Inc.

EEPROM-2

Functional Description

The unprogrammed state is a logic 1. Only the valid EEPROM bytes in

the nonprotected blocks and EENVR2 can be erased.

Use this procedure to erase EEPROM after first ensuring the block

protect feature is not set on the address block of the byte to be erased:

1. Clear/set EERAS1 and EERAS0 to select byte/block/bulk erase,

and set EELAT in EECR2. (See note A.)

2. Write any data to the desired address for byte erase, to any

address in the desired block for block erase, or to any array

address for bulk erase.

3. Set the EEPGM bit. (See note B.)

4. Wait for a time, tEEPGM,/tEEBLOCK/tEEBULK..

5. Clear EEPGM bit.

6. Wait for a time, tEEFPV, for the erasing voltage to fall.

7. Clear EELAT bits. (See note C.)

8. Repeat steps 1 to 7 for more EEPROM byte/block erasing.

EEBPx bit must be cleared to erase EEPROM data in the corresponding

block. If any EEBPx is set, the corresponding block can not be erased

and bulk erase mode does not apply.

NOTES:

a. Setting EELAT bit configures the address and data buses to

latch data for erasing the array. Only valid EEPROM

addresses with their data will be latched. If another

consecutive valid EEPROM write occurs, this address and

data will override the previous address and data. In block

erase mode, any EEPROM address in the block may be used

in step 2. All locations within this block will be erased. In bulk

erase mode, any EEPROM address may be used to erase the

whole EEPROM. EENVR2 is not affected with block or bulk

erase. Any attempts to read other EEPROM data will read the

latched data. If EELAT is set, other writes to the EECR2 will

only be allowed after a valid EEPROM write.

b. The EEPGM bit cannot be set if the EELAT bit is cleared and

a non-EEPROM write has occurred. This is to ensure proper

erasing sequence. Once EEPGM is set, the type of erase

MC68HC08AZ60 â Rev 1.0

EEPROM-2

57

For More Information On This Product,

Go to: www.freescale.com

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