MC68HC908AS60MFN MOTOROLA [Motorola, Inc], MC68HC908AS60MFN Datasheet - Page 107
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MC68HC908AS60MFN
Manufacturer Part Number
MC68HC908AS60MFN
Description
HCMOS Microcontroller Unit
Manufacturer
MOTOROLA [Motorola, Inc]
Datasheet
1.MC68HC908AS60MFN.pdf
(454 pages)
- Current page: 107 of 454
- Download datasheet (6Mb)
7.4.5 MCU Configuration
7.4.6 MC68HC908AS60 EEPROM Protect
MC68HC908AS60 — Rev. 1.0
MOTOROLA
The EEPROM non-volatile register (EENVR2) contains configurations
concerning block protection and redundancy. EENVR2 is physically
located on the bottom of the EEPROM array. The contents are
non-volatile and are not modified by reset. On reset, this special register
loads the EEPROM configuration into a corresponding volatile EEPROM
array configuration register (EEACR2). Thereafter, all reads to the
EENVR2 will reload EEACR2.
The EEPROM configuration can be changed by programming/erasing
the EENVR2 like a normal EEPROM byte. The new array configuration
will take effect with a system reset or a read of the EENVR2.
The EEPROM non-volatile register (EENVR2) also contains
general-purpose bits which can be used to enable/disable functions
within the MCU which, for safety reasons, need to be controlled from
non-volatile memory. On reset, this special register loads the MCU
configuration into the volatile EEPROM array configuration register
(EEACR2). Thereafter, all reads to the EENVR2 will reload EEACR2.
The MCU configuration can be changed by programming/erasing the
EENVR2 like a normal EEPROM byte. Note that it is the users
responsibility to program the EENVR2 register to the correct system
requirements and verify it prior to use. The new array configuration will
only take effect after a system reset or a read of the EENVR2.
The MC68HC908AS60 has a special protect option which prevents
program/erase access to memory locations $06F0–$06FF. This protect
function is enabled by programming the EEPRTCT bit in the EENVR2
to 0.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
EEPROM-2
Functional Description
Technical Data
EEPROM-2
107
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