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參數(shù)資料
| 型號： | XC866 |
| 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)： | 25/108頁 |
| 文件大小： | 979K |
| 代理商： | XC866 |
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XC866
Functional Description
Data Sheet
21
V1.0, 2006-02
3.2.3
Bit Protection Scheme
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 NDIV, WDTEN, PD, and SD.
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]
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| XC866-2FR | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| XC866-2RR | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| XC866-4FR | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| XC866-4RR | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
| XC866L-2FR | 8-bit Microcontroller with 2/4/8K Bytes In-System Programmable Flash |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XC866_05 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit Single Chip Microcontroller |
| XC866_07 | 制造商:INFINEON 制造商全稱:Infineon Technologies AG 功能描述:8-Bit Single-Chip Microcontroller |
| XC8661FRAABKXUMA1 | 制造商:Infineon Technologies AG 功能描述:MCU 8-bit XC800 8051 CISC ROMLess 5V 38-Pin TSSOP T/R 制造商:Infineon Technologies AG 功能描述:8 BIT FLASH - Tape and Reel 制造商:Infineon Technologies AG 功能描述:IC MCU 8BIT FLASH 38-TSSOP |
| XC8661FRIABFXUMA1 | 制造商:Infineon Technologies AG 功能描述:MCU 8-BIT XC800 8051 CISC ROMLESS 2.5V/5V 38-PIN TSSOP 制造商:Infineon Technologies AG 功能描述:8 BIT FLASH - Tape and Reel 制造商:Infineon Technologies AG 功能描述:IC MCU 8BIT FLASH 38-TSSOP |
| XC8661FRIABKXUMA1 | 制造商:Infineon Technologies AG 功能描述:MCU 8-Bit XC800 8051 CISC ROMLess 2.5V/5V 38-Pin TSSOP 制造商:Infineon Technologies AG 功能描述:8 BIT FLASH - Tape and Reel 制造商:Infineon Technologies AG 功能描述:IC MCU 8BIT FLASH 38-TSSOP |
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