参数资料
型号: SC102202VPVE
厂商: FREESCALE SEMICONDUCTOR INC
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP112
封装: LEAD FREE, LQFP-112
文件页数: 119/142页
文件大小: 6464K
代理商: SC102202VPVE
Device User Guide — 9S12DT128DGV2/D V02.15
78
Freescale Semiconductor
4.3 Security
The device will make available a security feature preventing the unauthorized read and write of the
memory contents. This feature allows:
Protection of the contents of FLASH,
Protection of the contents of EEPROM,
Operation in single-chip mode, No BDM possible
Operation from external memory with internal FLASH and EEPROM disabled.
The user must be reminded that part of the security must lie with the user’s code. An extreme example
would be user’s code that dumps the contents of the internal program. This code would defeat the purpose
of security. At the same time the user may also wish to put a back door in the user’s program. An example
of this is the user downloads a key through the SCI which allows access to a programming routine that
updates parameters stored in EEPROM.
4.3.1 Securing the Microcontroller
Once the user has programmed the FLASH and EEPROM (if desired), the part can be secured by
programming the security bits located in the FLASH module. These non-volatile bits will keep the part
secured through resetting the part and through powering down the part.
The security byte resides in a portion of the Flash array.
Check the Flash Block User Guide for more details on the security configuration.
4.3.2 Operation of the Secured Microcontroller
4.3.2.1 Normal Single Chip Mode
This will be the most common usage of the secured part. Everything will appear the same as if the part was
not secured with the exception of BDM operation. The BDM operation will be blocked.
4.3.2.2 Executing from External Memory
The user may wish to execute from external space with a secured microcontroller. This is accomplished
by resetting directly into expanded mode. The internal FLASH and EEPROM will be disabled. BDM
operations will be blocked.
Table 4-3 Voltage Regulator VREGEN
VREGEN
Description
1
Internal Voltage Regulator enabled
0
Internal Voltage Regulator disabled, VDD1,2 and
VDDPLL must be supplied externally with 2.5V
相关PDF资料
PDF描述
SC515846CPV 16-BIT, FLASH, 25 MHz, MICROCONTROLLER, PQFP112
S3S12HN64J3CAA 16-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP80
S3S12HN64J3VAA 16-BIT, MROM, 25 MHz, MICROCONTROLLER, PQFP80
SC103335VR400B 32-BIT, 400 MHz, MICROPROCESSOR, PBGA272
SAH-XC2265N-40F40L 32-BIT, FLASH, 40 MHz, RISC MICROCONTROLLER, PQFP100
相关代理商/技术参数
参数描述
SC102203 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:nullDevice User Guide
SC102204 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:nullDevice User Guide
SC102205 制造商:FREESCALE 制造商全称:Freescale Semiconductor, Inc 功能描述:nullDevice User Guide
SC10220KT 功能描述:固定电感器 SC10-10-0529-10 22UH AMMO 500 RoHS:否 制造商:AVX 电感:10 uH 容差:20 % 最大直流电流:1 A 最大直流电阻:0.075 Ohms 工作温度范围:- 40 C to + 85 C 自谐振频率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接类型:SMD/SMT 封装 / 箱体:6.6 mm x 4.45 mm
SC10221KT 功能描述:固定电感器 RoHS:否 制造商:AVX 电感:10 uH 容差:20 % 最大直流电流:1 A 最大直流电阻:0.075 Ohms 工作温度范围:- 40 C to + 85 C 自谐振频率:38 MHz Q 最小值:40 尺寸:4.45 mm W x 6.6 mm L x 2.92 mm H 屏蔽:Shielded 端接类型:SMD/SMT 封装 / 箱体:6.6 mm x 4.45 mm