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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AD664 датащи(PDF) 13 Page - Analog Devices |
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AD664 датащи(HTML) 13 Page - Analog Devices |
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13 / 20 page  AD664 REV. C –13– Figure 25a. Simple AD664 to MC6801 Interface Expansion of the scheme employed in Figure 25a results in that shown in Figure 25c. Here, two AD664s are connected to an MC6801, providing a total of eight 12-bit, software program- mable DACs. Again, the three least significant bits of address are used to select the on-chip registers of the AD664. IOS and E, as well as a fourth address bit, are decoded to provide the appropriate CS signals. Four address and five I/O lines remain uncommitted. A slightly more sophisticated approach to system expansion is illustrated in Figure 25d. Here, a 74LS138 (1-of-8 decoder) is used to address one of the eight AD664s connected to the MC6801. The three least significant address bits are used to select on-chip register and DAC. The next three address bits are used to select the appropriate AD664. IOS and E gate the 74LS138 output. Figure 25b. Alternate AD664 to MC6801 Interface Figure 25c. Interfacing Two AD664s to an MC6801 |
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