373
MC97F60128
ABOV Semiconductor Co., Ltd.
17.2 Flash Protection for Invalid Erase/Write
Overview
This is example to prevent changing code or data in flash by abnormal operation(noise, unstable power, malfunction,
etc…).
How to protect the flash
•
Divide into decision and execution to Erase/Write in flash.
-
Check the program sequence from decision to execution in order of precedence about Erase/Write.
-
Setting the flags in program and check the flags in main loop at the end
-
When the Flash Erase/Write is executed, check the flags. If not matched, do not execute.
•
Check the range of Flash Sector Address
-
If the flash sector address is outside of specific area, do not execute.
•
Use the Dummy Address
-
Set the flash sector address to dummy address in usually run time.
-
Change the flash sector address to real area range shortly before Erase/Write.
-
Even if invalid Erase/Write occurred, it will be Erase/Write in dummy address in flash.
•
Use the LVR/LVI
-
Unstable or low powers give an adverse effect on MCU. So use the LVR/LVI
Содержание MC97F60128
Страница 17: ...17 MC97F60128 ABOV Semiconductor Co Ltd 4 Package Diagram Figure 4 1 100 pin LQFP 1414 Package...
Страница 18: ...18 MC97F60128 ABOV Semiconductor Co Ltd Figure 4 2 80 Pin LQFP 1212 Package...
Страница 19: ...19 MC97F60128 ABOV Semiconductor Co Ltd Figure 4 3 80 Pin LQFP 1414 Package...
Страница 20: ...20 MC97F60128 ABOV Semiconductor Co Ltd Figure 4 4 64 Pin LQFP 1414 Package...