MC68HC08AZ16 Datasheet, PDF (49/527 Pages) Motorola, Inc – HCMOS Microcontroller Unit

EEPROM
MC68HC08AZ32
EEPROM Security
The MC68HC08AZ32 has a special security option which prevents
program/erase access to memory locations $08F0 to $08FF. This
security function is enabled by programming the CON0 bit in the EENVR
to 0.
In addition to disabling the program and erase operations on memory
locations $08F0 to $08FF the enabling of the security option has the
following effects:
• Bulk and block erase modes are disabled.
• Programming and erasing of thte EENVR is disabled.
• Unsecure locations ($0800-$08EF) can be erased using the single
byte erase function as normal.
• Secured locations can be read as normal.
• Writing to a secured location no longer qualifies as a “valid
EEPROM write” as detailed in EEPROM programming Note A.,
and EEPROM erasing Note F.
NOTE:
Once armed, the security is permanently enabled. As a consequence, all
functions in the EENVR will remain in the state they were in immediately
before the security was enabled.
MC68HC08AZ32
48
EEPROM
8-eeprom
MOTOROLA