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27页浏览型号68HC912DG128PV8的Datasheet PDF文件第28页浏览型号68HC912DG128PV8的Datasheet PDF文件第29页浏览型号68HC912DG128PV8的Datasheet PDF文件第30页浏览型号68HC912DG128PV8的Datasheet PDF文件第32页浏览型号68HC912DG128PV8的Datasheet PDF文件第33页浏览型号68HC912DG128PV8的Datasheet PDF文件第34页浏览型号68HC912DG128PV8的Datasheet PDF文件第35页  
Freescale Semiconductor, Inc.  
Central Processing Unit  
Data Types  
Condition Code Register (CCR) contains five status indicators, two  
interrupt masking bits, and a STOP disable bit. The five flags are half  
carry (H), negative (N), zero (Z), overflow (V), and carry/borrow (C). The  
half-carry flag is used only for BCD arithmetic operations. The N, Z, V,  
and C status bits allow for branching based on the results of a previous  
operation.  
After a reset, the CPU fetches a vector from the appropriate address and  
begins executing instructions. The X and I interrupt mask bits are set to  
mask any interrupt requests. The S bit is also set to inhibit the STOP  
instruction.  
2.4 Data Types  
The CPU12 supports the following data types:  
• Bit data  
• 8-bit and 16-bit signed and unsigned integers  
• 16-bit unsigned fractions  
• 16-bit addresses  
A byte is eight bits wide and can be accessed at any byte location. A  
word is composed of two consecutive bytes with the most significant  
byte at the lower value address. There are no special requirements for  
alignment of instructions or operands.  
2.5 Addressing Modes  
Addressing modes determine how the CPU accesses memory locations  
to be operated upon. The CPU12 includes all of the addressing modes  
of the M68HC11 CPU as well as several new forms of indexed  
addressing. Table 2-1 is a summary of the available addressing modes.  
MC68HC912DG128 — Rev 3.0  
Technical Data  
Central Processing Unit  
For More Information On This Product,  
Go to: www.freescale.com