MC68HC08AZ0 Datasheet, PDF (63/444 Pages) Motorola, Inc – Advance Information

Freescale Semiconductor, Inc.
EEPROM
Functional description
memory. On reset, this special register loads the MCU configuration into
the volatile EEPROM array configuration register (EEACR). Thereafter,
all reads to the EENVR will result in EEACR being reloaded.
The MCU configuration can be changed by programming/erasing the
EENVR like a normal EEPROM byte. Please note that it is the users
responsibility to program the EENVR register to the correct system
requirements and verify it prior to use. The new array configuration
will take effect with a system reset or a read of the EENVR.
MC68HC08AZ0
EEPROM Security
The MC68HC08AZ0 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 the EENVR is disabled.
• Non secure 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.
7-eeprom
MOTOROLA
EEPROM
For More Information On This Product,
Go to: www.freescale.com
MC68HC08AZ0
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