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参数资料
型号： SAF-XC866-2FRA
厂商： INFINEON TECHNOLOGIES AG
元件分类： 微控制器/微处理器
英文描述： 8-BIT, FLASH, 26.7 MHz, MICROCONTROLLER, PDSO38
封装： PLASTIC, GREEN, TSSOP-38
文件页数： 39/116页
文件大小： 1640K
代理商： SAF-XC866-2FRA
XC866
Functional Description
Data Sheet
25
V1.2, 2007-10
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 11B, writing 10011B to the
bit field PASS opens access to writing of all protected bits, and writing 10101B to the bit
field PASS closes access to writing of all protected bits. In both cases, the value of the
bit field MODE is not changed even if PASSWD register is written with 98H or A8H. It can
only be changed when bit field PASS is written with 11000B, for example, writing D0H to
PASSWD register disables the bit protection scheme.
The 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: 07H
76
5432
10
PASS
PROTECT
_S
MODE
wrh
rw
Field
Bits
Type Description
MODE
[1:0]
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 11B and 00B, the bit field PASS
must be written with 11000B; only then, will the
MODE[1:0] be registered.
PROTECT_S
2rh
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.
PASS
[7:3]
w
Password bits
The Bit Protection Scheme only recognizes three
patterns.
11000B Enables writing of the bit field MODE.
10011B Opens access to writing of all protected bits.
10101B Closes access to writing of all protected bits.
相关PDF资料
PDF描述
SAF-XC866-2RRI 8-BIT, FLASH, 26.7 MHz, MICROCONTROLLER, PDSO38
SAF-XC866-4FRA3V 8-BIT, FLASH, 26.7 MHz, MICROCONTROLLER, PDSO38
SAF-XC866-4FRA 8-BIT, FLASH, 26.7 MHz, MICROCONTROLLER, PDSO38
SAK-XC866-2FRI3V 8-BIT, FLASH, 26.7 MHz, MICROCONTROLLER, PDSO38
SAK-XC866-4FRI3V 8-BIT, FLASH, 26.7 MHz, MICROCONTROLLER, PDSO38
相关代理商/技术参数
参数描述
SAF-XC866-2FRA BE 功能描述:8位微控制器 -MCU 8-Bit Single-Chip 5V 26.67MHz Flash RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
SAF-XC866-2FRI 制造商:Infineon Technologies AG 功能描述:Micro,XC866,5V,8k Flash,Ind
SAF-XC866-2FRI BC 功能描述:8位微控制器 -MCU 8-Bit Single-Chip 3.3V 26.67MHz Flash RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
SAF-XC866-2FRI BE 功能描述:8位微控制器 -MCU ICMCU 8BIT XC800CISC 8KB FLASH 26.7MHZ 5V RoHS:否 制造商:Silicon Labs 核心:8051 处理器系列:C8051F39x 数据总线宽度:8 bit 最大时钟频率:50 MHz 程序存储器大小:16 KB 数据 RAM 大小:1 KB 片上 ADC:Yes 工作电源电压:1.8 V to 3.6 V 工作温度范围:- 40 C to + 105 C 封装 / 箱体:QFN-20 安装风格:SMD/SMT
SAFXC8662FRIBCXT 制造商:Infineon Technologies AG 功能描述:MCU 8-bit XC800 8051 CISC 4KB Flash 2.5V/5V 38-Pin TSSOP
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