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89C51RC2-UL 参数 Datasheet PDF下载

89C51RC2-UL图片预览
型号: 89C51RC2-UL
PDF下载: 下载PDF文件 查看货源
内容描述: 8位微控制器,带有16K / 32K字节的闪存 [8-bit Microcontroller with 16K/ 32K Bytes Flash]
分类和应用: 闪存微控制器
文件页数/大小: 127 页 / 1478 K
品牌: ATMEL [ ATMEL ]
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Dual Data Pointer  
Register (DPTR)  
The additional data pointer can be used to speed up code execution and reduce code  
size.  
The dual DPTR structure is a way by which the chip will specify the address of an exter-  
nal data memory location. There are two 16-bit DPTR registers that address the external  
memory, and a single bit called DPS = AUXR1.0 (see Table 17) that allows the program  
code to switch between them (see Figure 7).  
Figure 7. Use of Dual Pointer  
External Data Memory  
7
0
DPS  
DPTR1  
DPTR0  
AUXR1(A2H)  
DPH(83H) DPL(82H)  
20  
AT89C51RB2/RC2  
4180E–8051–10/06  
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