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參數(shù)資料
| 型號： | S12BKPV1D |
| 廠商： | Motorola, Inc. |
| 英文描述： | MC9S12DT128 Device User Guide V02.09 |
| 中文描述： | MC9S12DT128設備的用戶手冊V02.09 |
| 文件頁數(shù)： | 78/138頁 |
| 文件大小： | 2083K |
| 代理商： | S12BKPV1D |
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MC9S12DT128 Device User Guide — V02.09
78
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
Thiswillbethemostcommonusageofthesecuredpart.Everythingwillappearthesameasifthepartwas
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
1
Description
Internal Voltage Regulator enabled
Internal Voltage Regulator disabled, VDD1,2 and
VDDPLL must be supplied externally with 2.5V
0
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| S12BKVD1 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:Automotive applications |
| S12B-PADSS-1(LF)(SN) | 制造商:JST Manufacturing 功能描述:PAD Series 12 Position 2 mm Pitch Side Entry Shrouded Header Connector |
| S12B-PADSS-1-GW | 制造商:JST Manufacturing 功能描述:12 Position Side Entry Shrouded Header |
| S12B-PASK-2 | 功能描述:CONN HEADR PA 12POS SIDE 2MM TIN RoHS:否 類別:連接器，互連式 >> 矩形- 接頭，公引腳 系列:PA 標準包裝:1 系列:- 觸點類型：:公形引腳 連接器類型:接頭，無罩 位置數(shù):16 加載位置的數(shù)目:全部 間距:0.100"（2.54mm） 行數(shù):1 行間距:- 觸點接合長度:0.230"（5.84mm） 安裝類型:通孔 端子:焊接 緊固型:- 特點:- 觸點表面涂層:錫 觸點涂層厚度:100µin（2.54µm） 顏色:黑 包裝:散裝 配套產(chǎn)品:S7049-ND - CONN HEADER FMALE 16POS .1" GOLDS7014-ND - CONN HEADER FEMALE 16POS.1" TINS5647-ND - CONN FMALE 16POS .1" SMD GOLDS5608-ND - CONN FEMALE 16POS .1" SMD TINS5491-ND - CONN FEMALE 16POS .100" R/A GOLDS5452-ND - CONN FEMALE 16POS .100" R/A TINS4546-ND - CONN FMALE 16POS .1" SMD GOLDS4507-ND - CONN FEMALE 16POS .1" SMD TINS4390-ND - CONN FEMALE 16POS .100" R/A GOLDS4351-ND - CONN FEMALE 16POS .100" R/A TIN更多... 其它名稱:S1022-16 |
| S12B-PASK-2(LF)(SN) | 制造商:JST Manufacturing 功能描述:CONN HEADR PA 12POS SIDE 2MM TIN 制造商:JST Manufacturing 功能描述:PA Series 12 Position 2 mm Through Hole Wire to Board Single Row Shrouded Header 制造商:JST Manufacturing 功能描述:12 way side entry PCB header PA 2.0 |
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