saa-xc886clm Infineon Technologies Corporation, saa-xc886clm Datasheet - Page 25
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saa-xc886clm
Manufacturer Part Number
saa-xc886clm
Description
8-bit Single Chip Microcontroller
Manufacturer
Infineon Technologies Corporation
Datasheet
1.SAA-XC886CLM.pdf
(134 pages)
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3.2.1
The SAA-XC886 memory protection strategy includes:
•
•
3.2.1.1
As long as a valid password is available, all external access to the device, including the
Flash, will be blocked.
For additional security, the Flash hardware protection can be enabled to implement a
second layer of read-out protection, as well as to enable program and erase protection.
Flash hardware protection is available only for Flash devices and comes in two modes:
•
•
The selection of each protection mode and the restrictions imposed are summarized in
Table
Table 3
Flash Protection Without hardware
Hardware
Protection Mode
Activation
Selection
P-Flash
contents can be
read by
External access
to P-Flash
P-Flash program
and erase
D-Flash
contents can be
read by
Data Sheet
Read-out protection: The user is able to protect the contents in the Flash memory
from being read
– Flash protection is enabled by programming a valid password (8-bit non-zero
Flash program and erase protection.
Mode 0: Only the P-Flash is protected; the D-Flash is unprotected
Mode 1: Both the P-Flash and D-Flash are protected
value) via BSL mode 6.
3.
Memory Protection Strategy
Flash Memory Protection
Flash Protection Modes
protection
-
Program a valid password via BSL mode 6
Bit 4 of password = 0 Bit 4 of password = 1
Read instructions in
any program memory
Not possible
Possible
Read instructions in
any program memory
With hardware protection
0
MSB of password = 0
Read instructions in
the P-Flash
Not possible
Not possible
Read instructions in
any program memory
18
Functional Description
1
Bit 4 of password = 1
MSB of password = 1
Read instructions in
the P-Flash or D-
Flash
Not possible
Not possible
Read instructions in
the P-Flash or D-
Flash
SAA-XC886CLM
V1.0, 2009-09
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