MC68HC908KX2 MOTOROLA [Motorola, Inc], MC68HC908KX2 Datasheet - Page 55

• Manufacturer Part Number: MC68HC908KX2
• Description: Microcontrollers
• Manufacturer: MOTOROLA [Motorola, Inc]

4.8 FLASH Block Protection
MC68HC908KX8 • MC68HC908KX2 • MC68HC08KX8 — Rev. 1.0
MOTOROLA
NOTE:
NOTE:
This program sequence is repeated throughout the memory until all data
is programmed.
Programming and erasing of FLASH locations cannot be performed by
code being executed from the FLASH memory. While these operations
must be performed in the order shown, other unrelated operations may
occur between the steps. Do not exceed t
See
Due to the ability of the on-board charge pump to erase and program the
FLASH memory in the target application, provision is made for protecting
a block of memory from unintentional erase or program operations due
to system malfunction. This protection is done by using the FLASH block
protect register (FLBPR). The FLBPR determines the range of the
FLASH memory which is to be protected. The range of the protected
area starts from a location defined by FLBPR and ends at the bottom of
the FLASH memory ($FFFF). When the memory is protected, the HVEN
bit cannot be set in either erase or program operations.
In performing a program or erase operation, the FLASH block protect
register must be read after setting the PGM or ERASE bit and before
asserting the HVEN bit.
When FLBPR is programmed with all 0s, the entire memory is protected
from being programmed and erased. When all the bits are erased
(all 1s), the entire memory is accessible for program and erase.
When bits within the FLBPR are programmed, they lock a block of
memory address ranges as shown in
Register. Once the FLBPR is programmed with a value other than $FF,
any erase or program of the FLBPR or the protected block of FLASH
memory is prohibited. The FLBPR itself can be erased or programmed
only with an external voltage, V
also allows entry from reset into the monitor mode.
20.12 Memory
FLASH Memory
Characteristics.
TST
, present on the IRQ pin. This voltage
4.9 FLASH Block Protect
PROG
maximum.
FLASH Block Protection
FLASH Memory
Technical Data
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