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ADC0801 参数 Datasheet PDF下载

ADC0801图片预览
型号: ADC0801
PDF下载: 下载PDF文件 查看货源
内容描述: 8位向上兼容A / D转换器 [8-Bit uP Compatible A/D Converters]
分类和应用: 转换器
文件页数/大小: 41 页 / 1119 K
品牌: NSC [ National Semiconductor ]
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Functional Description (Continued)  
DS005671-A5  
Note 29: All numerical values are hexadecimal representations.  
FIGURE 21. Software for Auto-Zeroed Differential A/D  
5.3 Multiple A/D Converters in a Z-80 Interrupt Driven  
Mode (Continued)  
The stack pointer must be dimensioned in the main pro-  
gram as the RST 7 instruction automatically pushes the  
PC onto the stack and the subroutine uses an additional  
6 stack addresses.  
The following notes apply:  
It is assumed that the CPU automatically performs a RST  
7 instruction when a valid interrupt is acknowledged  
(CPU is in interrupt mode 1). Hence, the subroutine start-  
ing address of X0038.  
The peripherals of concern are mapped into I/O space  
with the following port assignments:  
The address bus from the Z-80 and the data bus to the  
Z-80 are assumed to be inverted by bus drivers.  
A/D data and identifying words will be stored in sequen-  
tial memory locations starting at the arbitrarily chosen ad-  
dress X 3E00.  
37  
www.national.com  
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