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XC68HC912D60FU8 参数 Datasheet PDF下载

XC68HC912D60FU8图片预览
型号: XC68HC912D60FU8
PDF下载: 下载PDF文件 查看货源
内容描述: 超前信息 - 冯4.0 [Advance Information - Rev 4.0]
分类和应用: 微控制器和处理器外围集成电路时钟
文件页数/大小: 432 页 / 2948 K
品牌: MOTOROLA [ MOTOROLA ]
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Freescale Semiconductor, Inc.  
Central Processing Unit  
2.7 Opcodes and Operands  
The CPU12 uses 8-bit opcodes. Each opcode identifies a particular  
instruction and associated addressing mode to the CPU. Several  
opcodes are required to provide each instruction with a range of  
addressing capabilities.  
Only 256 opcodes would be available if the range of values were  
restricted to the number that can be represented by 8-bit binary  
numbers. To expand the number of opcodes, a second page is added to  
the opcode map. Opcodes on the second page are preceded by an  
additional byte with the value $18.  
To provide additional addressing flexibility, opcodes can also be  
followed by a postbyte or extension bytes. Postbytes implement certain  
forms of indexed addressing, transfers, exchanges, and loop primitives.  
Extension bytes contain additional program information such as  
addresses, offsets, and immediate data.  
Advance Information  
36  
68HC(9)12D60 — Rev 4.0  
Central Processing Unit  
MOTOROLA  
For More Information On This Product,  
Go to: www.freescale.com