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MCP2140-IP データシート(PDF) 8 Page - Microchip Technology |
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MCP2140-IP データシート(HTML) 8 Page - Microchip Technology |
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8 / 58 page  MCP2140 DS21790A-page 8 Preliminary 2003 Microchip Technology Inc. 2.3.1.2 External Clock For applications where a clock is already available elsewhere, users may directly drive the MCP2140 pro- vided that this external clock source meets the AC/DC timing requirements listed in Section 4.3, “Timing Dia- grams and Specifications”. Figure 2-2 shows how an external clock circuit should be configured. FIGURE 2-2: EXTERNAL CLOCK 2.3.2 BIT CLOCK The device crystal is used to derive the communication bit clock (BITCLK). There are 16 BITCLKs for each bit time. The BITCLKs are used for the generation of the start bit and the eight data bits. The stop bit uses the BITCLK when the data is transmitted (not for reception). This clock is a fixed-frequency and has minimal variation in frequency (specified by the crystal manufacturer). Clock From external MCP2140 OSC1 OSC2 Open system |
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