參數(shù)資料
型號: XC886CLM
廠商: INFINEON TECHNOLOGIES AG
元件分類: 8位微控制器
英文描述: 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
中文描述: 8位微控制器與2/4/8K字節(jié)在系統(tǒng)可編程閃存
文件頁數(shù): 31/119頁
文件大?。?/td> 895K
代理商: XC886CLM
XC886/888CLM
Functional Description
Data Sheet
Prelimary
27
V0.1, 2006-02
3.2.3
The bit protection scheme prevents direct software writing of selected bits (i.e., protected
bits) using the PASSWD register. When the bit field MODE is 11
B
, writing 10011
B
to the
bit field PASS opens access to writing of all protected bits, and writing 10101
B
to the bit
field PASS closes access to writing of all protected bits. Note that access is opened for
maximum 32 CCLKs if the “close access” password is not written. If “open access”
password is written again before the end of 32 CCLK cycles, there will be a recount of
32 CCLK cycles. The protected bits include the N- and K-Divider bits, NDIV and KDIV;
the Watchdog Timer enable bit, WDTEN; and the power-down and slow-down enable
bits, PD and SD.
Bit Protection Scheme
PASSWD
Password Register
Reset Value: 07
H
7
6
5
4
3
2
1
0
PASS
PROTECT
_S
MODE
wh
rh
rw
Field
MODE
Bits
[1:0]
Type Description
rw
Bit Protection Scheme Control bits
00
Scheme Disabled
11
Scheme Enabled (default)
Others: Scheme Enabled
These two bits cannot be written directly. To change
the value between 11
B
and 00
B
, the bit field PASS
must be written with 11000
B
; only then, will the
MODE[1:0] be registered.
rh
Bit Protection Signal Status bit
This bit shows the status of the protection.
0
Software is able to write to all protected bits.
1
Software is unable to write to any protected
bits.
wh
Password bits
The Bit Protection Scheme only recognizes three
patterns.
11000
B
Enables writing of the bit field MODE.
10011
B
Opens access to writing of all protected bits.
10101
B
Closes access to writing of all protected bits.
PROTECT_S
2
PASS
[7:3]
相關(guān)PDF資料
PDF描述
XC886CM 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
XC886LM 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
XC888 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
XC888C 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
XC888CLM 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash
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