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数据搜索系统，热门电子元器件搜索 |
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数据搜索系统，热门电子元器件搜索 |
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ADC0804LCWM 数据表(PDF) 37 Page - National Semiconductor (TI) |
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ADC0804LCWM 数据表(HTML) 37 Page - National Semiconductor (TI) |
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37 / 41 page  Functional Description (Continued) 5.3 Multiple A/D Converters in a Z-80 Interrupt Driven Mode (Continued) 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 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. • 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 peripherals of concern are mapped into I/O space with the following port assignments: DS005671-A5 Note 29: All numerical values are hexadecimal representations. FIGURE 21. Software for Auto-Zeroed Differential A/D www.national.com 37 |
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