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Chapter 20
Flash Memory (µPD70F3123)
Preliminary User’s Manual U14913EE1V0UM00
Figure 20-10: Secure Selfprogramming Flow (2/2)
20.9.4 Advantages of Secure Selfprogramming
• A boot program is always available, thus ensuring that the device can always be reprogrammed.
• The size of the boot block is not fixed. All sizes up to 128 KB are supported.
• It is possible to update the boot program using the secure mechanisms.
Vector Table
Vector Table
Vector Table
Signature
Signature
Signature
Bootblock Size
Bootblock Size
Bootblock Size
Bootprogram
Bootprogram
Bootprogram
New Application
Part 1
New Application
Part 2
Erased
Erased
Erased
Vector Table
Bootblock Size
Bootprogram
Application Part 1
00000000H
00020000H
0003FFFFH
Area 1
Area 1
Area 1
Area 0
Area 0
Area 0
Erase upper
Area
Write application
to the Flash
Relocate
Areas
Upper
Area
Lower
Area
Содержание V850E/CA1 ATOMIC
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