XC908AS60ACFU Motorola Semiconductor Products, XC908AS60ACFU Datasheet - Page 94

• Manufacturer Part Number: XC908AS60ACFU
• Description: MC68HC908AZ60A, MC68HC908AS60A Hcmos Microcontroller Unit Technical Data
• Manufacturer: Motorola Semiconductor Products

EEPROM-1 Memory
6.5.4 EEPROM-1 Block Protection
Technical Data
94
NOTE:
NOTE:
Once armed, the protect option is permanently enabled. As a
consequence, all functions in the EE1NVR will remain in the state they
were in immediately before the security was enabled.
The 512 bytes of EEPROM-1 are divided into four 128-byte blocks. Each
of these blocks can be protected from erase/program operations by
setting the EEBPx bit in the EE1NVR.
ranges for the blocks.
These bits are effective after a reset or a upon read of the EE1NVR
register. The block protect configuration can be modified by
erasing/programming the corresponding bits in the EE1NVR register
and then reading the EE1NVR register. Please see
Configuration Register
Once EEDIVSECD in the EE1DIVHNVR is programmed to 0 and after a
system reset, the EE1DIV security feature is permanently enabled
because the EEDIVSECD bit in the EE1DIVH is always loaded with 0
thereafter. Once this security feature is armed, erase and program mode
are disabled for EE1DIVHNVR and EE1DIVLNVR. Modifications to the
EE1DIVH and EE1DIVL registers are also disabled. Therefore, be
cautious on programming a value into the EE1DIVHNVR.
•
Single byte program and erase operations are still available for
locations $0800-$08EF and $0900-$09FF for all bytes that are not
protected by the EEPROM-1 Block Protect EEBPx bits (see
EEPROM-1 Block Protection
Configuration Register
Block Number (EEBPx)
Table 6-1. EEPROM-1 Array Address Blocks
EEPROM-1 Memory
EEBP0
EEBP1
EEBP2
EEBP3
on page 101 for more information.
on page 101)
on page 94 and
Table 6-1
Address Range
$0880–$08FF
$0980–$09FF
$0800–$087F
$0900–$097F
MC68HC908AZ60A — Rev 2.0
shows the address
EEPROM-1 Array
EEPROM-1 Array
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