SAF-XC864L-1FRI3V3 查看數據表（PDF） - Infineon Technologies

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SAF-XC864L-1FRI3V3

8-Bit Single-Chip Microcontroller

Infineon Technologies 

XC864

Functional Description

3.2.1 Memory Protection Strategy

The XC864 memory protection strategy includes:

• Read-out protection: The user is able to protect the contents in the Flash memory from

being read

• Flash program and erase protection: The Flash memory in all devices can be enabled

for program and erase protection

• Block external access and allow only boot in User Mode: Disable BSL and OCDS

modes.

Flash memory protection modes provided are:

• Mode 0: Protect against accidental erase and block external access.

• Mode 1: Read, program and erase protection are enabled, and block external access.

Flash protection is enabled by installing the user password via BSL mode 6. The user

setting of password for selection of each protection mode and the restrictions imposed

are summarized in Table 2. Flash protection mode 1 is meaningful only if the Flash is

used for code only. Otherwise if the Flash is used partially for code and partially for data,

then only Flash protection mode 0 is meaningful.

Note: In XC864, the type of Flash protection scheme will affect the entering of BSL Mode

once User Mode is entered.

Table 2

Flash Protection Modes

Mode

Selection

Flash contents

can be read by

Flash program

0

MSB of password = 0

Read instructions in any program

memory

Possible

1

MSB of password = 1

Read instructions in Flash

Not possible

Data Sheet

13

V 1.1, 2009-03

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