XR82C684CJ-F Datasheet, PDF (63/107 Pages) Exar Corporation – CMOS Quad Channel UART(QUART)

XR82C684
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X - The Select Extend bit
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Resulting Action
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Table 16. Command Register Controls Over the Extend Bit
Note:
If the user programs either nibble of the Clock
Select Register (CSRn[7:4] or CSRn[3:0]) with
values ranging from 0₁₆ to C₁₆, then the user is
using the BRG as a source for timing. How-
ever, these standard bit rates (presented in
Table 15) apply only if the X1/CLK pin is driven
with a 3.6864 MHz signal. If a signal with a
different frequency (fo) is applied to the X1/CLK
pin, then the QUART channel is running at the
following baud rate:
Actual baud Rate =
PTable 9 Baud Rate ValueQ T fo
4.0.@ MHz
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Actual baud Rate =
PTable 9A Baud Rate ValueQ T fo
B4B0 MHz
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1X vs 16X Clock Signals
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