NS16C2552 Datasheet, PDF (39/43 Pages) National Semiconductor (TI) – Dual UART with 16-byte/64-byte FIFOs and up to 5 Mbit/s Data Rate

11.0 Timing Diagrams
FIGURE 17. External Clock Input
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FIGURE 18. Modem Control Timing
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FIGURE 19. Host Interface Read Timing
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