xr82c684 Exar Corporation, xr82c684 Datasheet - Page 67

• Manufacturer Part Number: xr82c684
• Description: Cmos Quad Channel Uart Quart
• Manufacturer: Exar Corporation

Example B: Programming the Bit Rate via the
Counter/Timer
bit rate is not offered by the BRG. In this case the user can
do the following.
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.
Please note that this particular
Table 14
Table 15
Thus: Bit Rate = 1 MHz/16 = 62.5 kbps.
Example C: Using the External Input Ports
Note: x = don’t care
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.
XR82C684