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參數(shù)資料
| 型號： | S12BFV1D |
| 廠商： | Motorola, Inc. |
| 英文描述： | MC9S12DT128 Device User Guide V02.09 |
| 中文描述： | MC9S12DT128設(shè)備的用戶手冊V02.09 |
| 文件頁數(shù)： | 79/138頁 |
| 文件大?。?/td> | 2083K |
| 代理商： | S12BFV1D |
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MC9S12DT128 Device User Guide — V02.09
79
4.3.3 Unsecuring the Microcontroller
In order to unsecure the microcontroller, the internal FLASH and EEPROM must be erased. This can be
done through an external program in expanded mode or via a .sequence of BDM commands. Unsecuring
is also possible via the Backdoor Key Access. Refer to Flash Block Guide for details.
Once the user has erased the FLASH and EEPROM, the part can be reset into special single chip mode.
This invokes a program that verifies the erasure of the internal FLASH and EEPROM. Once this program
completes,theusercaneraseandprogramtheFLASHsecuritybitstotheunsecuredstate.Thisisgenerally
done through the BDM, but the user could also change to expanded mode (by writing the mode bits
through the BDM) and jumping to an external program (again through BDM commands). Note that if the
part goes through a reset before the security bits are reprogrammed to the unsecure state, the part will be
secured again.
4.4 Low Power Modes
The microcontroller features three main low power modes. Consult the respective Block User Guide for
information on the module behavior in Stop, Pseudo Stop, and Wait Mode. An important source of
information about the clock system is the Clock and Reset Generator User Guide (CRG).
4.4.1 Stop
Executing the CPU STOP instruction stops all clocks and the oscillator thus putting the chip in fully static
mode. Wake up from this mode can be done via reset or external interrupts.
4.4.2 Pseudo Stop
This mode is entered by executing the CPU STOP instruction. In this mode the oscillator is still running
and the Real Time Interrupt (RTI) or Watchdog (COP) sub module can stay active. Other peripherals are
turned off. This mode consumes more current than the full STOP mode, but the wake up time from this
mode is significantly shorter.
4.4.3 Wait
This mode is entered by executing the CPU WAI instruction. In this mode the CPU will not execute
instructions.TheinternalCPUsignals(addressanddatabus)willbefullystatic.Allperipheralsstayactive.
For further power consumption the peripherals can individually turn off their local clocks.
4.4.4 Run
Although this is not a low power mode, unused peripheral modules should not be enabled in order to save
power.
相關(guān)PDF資料 |
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| S12BKPV1 | MC9S12DT128 Device User Guide V02.09 |
| S12BKPV1D | MC9S12DT128 Device User Guide V02.09 |
| S12CPUV2 | MC9S12DT128 Device User Guide V02.09 |
| S12CPUV2D | MC9S12DT128 Device User Guide V02.09 |
| S12CRGV4 | MC9S12DT128 Device User Guide V02.09 |
相關(guān)代理商/技術(shù)參數(shù) |
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| S12B-J21DK-GGXR(LF)(AU) | 制造商:JST Manufacturing 功能描述:12 position 2.5mm Board to Board Header |
| S12B-J25DK-GGR(LF)(SN) | 制造商:JST Manufacturing 功能描述:12 Circuit 17.5mm by 22.3mm Side Entry Header |
| S12B-JL-R(LF)(SN) | 制造商:JST Manufacturing 功能描述:S2B Series 12 Position Right Angle SMD Contact |
| S12BKPV1 | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:MC9S12DT128 Device User Guide V02.09 |
| S12BKPV1D | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:MC9S12DT128 Device User Guide V02.09 |
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