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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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MPC8548ECPXATHC датащи(PDF) 26 Page - Freescale Semiconductor, Inc |
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MPC8548ECPXATHC датащи(HTML) 26 Page - Freescale Semiconductor, Inc |
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26 / 151 page  MPC8548E PowerQUICC III Integrated Processor Hardware Specifications, Rev. 9 26 Freescale Semiconductor DUART 7 DUART This section describes the DC and AC electrical specifications for the DUART interface of the device. 7.1 DUART DC Electrical Characteristics This table provides the DC electrical characteristics for the DUART interface. 7.2 DUART AC Electrical Specifications This table provides the AC timing parameters for the DUART interface. Table 20. DUART DC Electrical Characteristics Parameter Symbol Min Max Unit High-level input voltage VIH 2OVDD + 0.3 V Low-level input voltage VIL –0.3 0.8 V Input current (VIN 1 = 0 V or V IN = VDD) IIN —±5 A High-level output voltage (OVDD = min, IOH = –2 mA) VOH 2.4 — V Low-level output voltage (OVDD = min, IOL = 2 mA) VOL —0.4 V Note: 1. Note that the symbol VIN, in this case, represents the OVIN symbol referenced in Table 1 and Table 2. Table 21. DUART AC Timing Specifications Parameter Value Unit Notes Minimum baud rate fCCB/1,048,576 baud 1, 2 Maximum baud rate fCCB/16 baud 1, 2, 3 Oversample rate 16 — 1, 4 Notes: 1. Guaranteed by design. 2. fCCB refers to the internal platform clock. 3. Actual attainable baud rate is limited by the latency of interrupt processing. 4. The middle of a start bit is detected as the 8th sampled 0 after the 1-to-0 transition of the start bit. Subsequent bit values are sampled each 16th sample. |
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