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数据搜索系统，热门电子元器件搜索 |
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TP3420AV 数据表(PDF) 23 Page - National Semiconductor (TI) |
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TP3420AV 数据表(HTML) 23 Page - National Semiconductor (TI) |
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23 / 32 page  Typical Applications (Continued) POPULAR MICROWIRE FORMATS The TP3420A enhanced MICROWIRE port supports two popular formats used in typical terminal equipment applica- tions. 1. CCLK idling LOW when the CS pin is inactive HIGH, pulsing LOW/HIGH/LOW for 8 clocks then returning back to LOW for idle condition. Data is output on the CO pin on the negative edge and data is sampled in on the positive edge of CCLK. This format (shown in Figure 7) is normally used with NSC’s microcontrollers from the HPC or the COP8 family. 2. CCLK idling HIGH when the CS pin is inactive HIGH, pulsing HIGH/LOW/HIGH for 8 clocks, then returning back to HIGH for idle condition. Data is output on the CO pin on the negative edge and data sampled in on the positive edge of CCLK. This format (shown in Figure 8) is normally used with other alternate microcontrollers in the industry. DS009143-24 FIGURE 7. TP3420A Normal MICROWIRE Clock Format DS009143-25 FIGURE 8. TP3420A Alternate MICROWIRE Clock Format www.national.com 23 |
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