AN1827 Freescale Semiconductor / Motorola, AN1827 Datasheet - Page 26

• Manufacturer Part Number: AN1827
• Description: Programming and Erasing FLASH Memory on the MC68HC908AS60
• Manufacturer: Freescale Semiconductor / Motorola

Application Note
26
Question 18
Question 19
Question 20
Question 21
Question 22
Answer 18
Answer 19
Answer 20
Answer 21
Answer 22
In the monitor mode, how I can tell if the break security has been
successful?
If the security check was unsuccessful, memory reads will return the
same data for every byte read instead of the code or data expected.
Do I need to confirm the memory contents after programming the
FLASH?
It is recommended that the code used to program the FLASH also
include a verification step to ensure the integrity of the data programmed
into the FLASH. Some sort of error flag should be set if the data in the
FLASH does not agree with what was programmed.
A block of memory in the FLASH array is protected by programming the
block protect register. When I execute bulk erase without applying high
voltage on the IRQ pin, will all of the array, except for the protected block,
be erased?
No. If any part of the array being bulk erased is protected, the bulk erase
operation is defeated unless high voltage is placed on IRQ.
What is the expected lifetime of FLASH memory?
The minimum program/erase endurance and data retention lifetime of
the FLASH memory for all conditions is found in MC68HC908AS60
Advance Information, Motorola document order number
MC68HC908AS60/D.
What steps can I take to prolong the life of the FLASH memory?
The FLASH memory has a finite program/erase and data retention
lifetime. However, the specification shows the minimum lifetime
considering the worst case set of conditions applied to the part. In
general, the FLASH will last longer if it is used at temperatures much
lower than the maximum specified, such as 25 C. The program/erase
endurance and data retention of this FLASH memory is worst at 125 C.
Freescale Semiconductor, Inc.
For More Information On This Product,
Go to: www.freescale.com
MOTOROLA
AN1827