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68HC912DG128PV8 参数 Datasheet PDF下载

68HC912DG128PV8图片预览
型号: 68HC912DG128PV8
PDF下载: 下载PDF文件 查看货源
内容描述: M68HC12微控制器 [M68HC12 Microcontrollers]
分类和应用: 微控制器外围集成电路时钟
文件页数/大小: 452 页 / 3509 K
品牌: FREESCALE [ Freescale ]
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Freescale Semiconductor, Inc.  
Development Support  
Background Debug Mode  
18.4.4.1 Enabling BDM lockout  
Enabling the BDM lockout feature is only possible in special modes  
(SMODN=0) and is accomplished by the following steps.  
1. Remove the SHADOW byte protection by clearing SHPROT bit in  
EEPROT register.  
2. Clear NOSHB bit in EEMCR register to make the SHADOW byte  
visible at $0FC0.  
3. Program bit 7 of the SHADOW byte like a regular EEPROM  
location at address $0FC0 (write $7F into address $0FC0). Do not  
program other bits of the SHADOW byte (location $0FC0);  
otherwise some regular EEPROM array locations will not be  
visible. At the next reset, the SHADOW byte is loaded into the  
EEMCR register. NOBDML bit in EEMCR will be cleared and BDM  
will not be operational.  
4. Protect the SHADOW byte by setting SHPROT bit in EEPROT  
register.  
18.4.4.2 Disabling BDM lockout  
Disabling the BDM lockout is only possible in special modes  
(SMODN=0). Follow the same steps as for enabling the BDM lockout,  
but erase the SHADOW byte.  
At the next reset, the SHADOW byte is loaded into the EEMCR register.  
NOBDML bit in EEMCR will be set and BDM becomes operational.  
NOTE: When the BDM lockout is enabled it is not possible to run code from the  
reset vector in special single chip mode.  
MC68HC912DG128 — Rev 3.0  
Technical Data  
Development Support  
For More Information On This Product,  
Go to: www.freescale.com  
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