XR82C684CJ View Datasheet(PDF) - Exar Corporation

Part Name

Description

MFG CO.

XR82C684CJ

CMOS Quad Channel UART (QUART)

Exar Corporation 

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XR82C684

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Example B: Programming the Bit Rate via the

Counter/Timer

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bit rate is not offered by the BRG. In this case the user can

do the following.

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Please note that when the QUART is programmed in this

configuration, the C/T output represents a 16X over

sample of the Transmitted and Received data. Therefore,

the chip circuitry will divide the 1 MHz square wave by 16,

just like for clock signals originating from the BRG.

Thus: Bit Rate = 1 MHz/16 = 62.5 kbps.

Example C: Using the External Input Ports

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Please note that if the user were to apply this example,

he/she would be responsible for ensuring that the

incoming serial data stream is synchronous with the 1

MHz (1X) clock signal; in order to minimize bit errors.

 

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