XR82C684CJ-F Datasheet, PDF (55/107 Pages) Exar Corporation – CMOS Quad Channel UART(QUART)

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Figure 28A. Block Diagram of the Portion of the QUART Timing Control Block Which Services
Channels C and D
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  ! Please note that each “half” of the Timing Control
Block consists of a 16-bit Counter/Timer, a Baud Rate
Generator, a set of four external clock inputs and four 32:1
MUX’s. Each “half” of the Timing Control Block shares the
output of the Oscillator Circuit.
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D.1 Oscillator Circuit:
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