欢迎访问ic37.com |
会员登录 免费注册
发布采购

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 ]
 浏览型号68HC912DG128PV8的Datasheet PDF文件第360页浏览型号68HC912DG128PV8的Datasheet PDF文件第361页浏览型号68HC912DG128PV8的Datasheet PDF文件第362页浏览型号68HC912DG128PV8的Datasheet PDF文件第363页浏览型号68HC912DG128PV8的Datasheet PDF文件第365页浏览型号68HC912DG128PV8的Datasheet PDF文件第366页浏览型号68HC912DG128PV8的Datasheet PDF文件第367页浏览型号68HC912DG128PV8的Datasheet PDF文件第368页  
Freescale Semiconductor, Inc.  
Development Support  
The external host should delay about 32 target BCLK cycles after the  
data portion of firmware write commands to allow BDM firmware to  
complete the requested write operation before a new serial command  
disturbs the BDM SHIFTER register.  
The external host should delay about 64 target BCLK cycles after a  
TRACE1 or GO command before starting any new serial command. This  
delay is needed because the BDM SHIFTER register is used as a  
temporary data holding register during the exit sequence to user code.  
BDM logic retains control of the internal buses until a read or write is  
completed. If an operation can be completed in a single cycle, it does not  
intrude on normal CPU12 operation. However, if an operation requires  
multiple cycles, CPU12 clocks are frozen until the operation is complete.  
18.4.4 BDM Lockout  
The access to the MCU resources by BDM may be prevented by  
enabling the BDM lockout feature. When enabled, the BDM lockout  
mechanism prevents the BDM from being active. In this case the BDM  
ROM is disabled and does not appear in the MCU memory map.  
BDM lockout is enabled by clearing NOBDML bit of EEMCR register.  
The NOBDML bit is loaded at reset from the SHADOW byte of EEPROM  
module. Modifying the state of the NOBDML and corresponding  
EEPROM SHADOW bit is only possible in special modes.  
Please refer to EEPROM Memory for NOBDML information.  
Technical Data  
MC68HC912DG128 — Rev 3.0  
Development Support  
For More Information On This Product,  
Go to: www.freescale.com  
 复制成功!