saf-xc878m-16ffi5v Infineon Technologies Corporation, saf-xc878m-16ffi5v Datasheet - Page 31

• Manufacturer Part Number: saf-xc878m-16ffi5v
• Description: 8-bit Single-chip Microcontroller
• Manufacturer: Infineon Technologies Corporation

3.2.1
The XC87x memory protection strategy includes:
•
•
•
These protection strategies are enabled by programming a valid password (16-bit non-
one value) via Bootstrap Loader (BSL) mode 6.
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 4
Flash
Protection
Hardware
Protection
Mode
Activation
Selection
P-Flash
contents
can be read
by
External
access to P-
Flash
Data Sheet
Basic protection: The user is able to block any external access via the boot option to
any memory
Read-out protection: The user is able to protect the contents in the Flash
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
4.
Memory Protection Strategy
Flash Memory Protection
Flash Protection Modes
Without hardware
protection
-
Program a valid password via BSL mode 6
Bit 13 of password = 0
Read instructions in
any program memory
Not possible
With hardware protection
0
Bit 13 of password = 1
MSB of password = 0
Read instructions in
the P-Flash
Not possible
24
Functional Description
1
Bit 13 of password = 1
MSB of password = 1
Read instructions in
the P-Flash or D-
Flash
Not possible
XC87xCLM
V1.5, 2011-03