xr20v2172 Exar Corporation, xr20v2172 Datasheet - Page 35

• Manufacturer Part Number: xr20v2172
• Description: Two Channel I2c/spi Uart With 64-byte Fifo And Rs232 Transceiver
• Manufacturer: Exar Corporation

REV. 1.0.0
EFCR[7]: IrDA mode
This bit selects between the slow and fast IrDA modes. See
Only)” on page 19
•
•
EFCR[6:3]: Reserved
These bits are reserved and should be left at "0000".
EFCR[2]: Transmitter Disable
UART does not send serial data out on the TX output pin, but the TX FIFO will continue to receive data from
CPU until full. Any data in the TSR will be sent out before the trasnmitter goes into disable state.
•
•
EFCR[1] = Receiver Disable
UART will stop receiving data immediately once this bit is set to a Logic 1. Any data that is being received in
the TSR will be received correctly and sent to the RX FIFO.
•
•
EFCR[0]: Reserved
This bit is reserved and should remain at a logic 0.
These registers make-up the value of the baud rate divisor. The concatenation of the contents of DLM and
DLL is a 16-bit value is then added to DLD[3:0]/16 to achieve the fractional baud rate divisor. DLD must be
enabled via EFR bit-4 before it can be accessed.
FRACTIONAL DIVISOR” ON PAGE 10.
DLD[5:4]: Sampling Rate Select
These bits select the data sampling rate. By default, the data sampling rate is 16X. The maximum data rate will
double if the 8X mode is selected and will quadruple if the 4X mode is selected. See
DLD[7:6]: Reserved
4.19
4.20
Logic 0 = IrDA version 1.0, 3/16 pulse ratio, data rate up to 115.2 Kbps
Logic 1 = IrDA version 1.1, 1/4 pulse ratio, data rate up to 1.152 Mbps
Logic 0 = Transmitter is enabled
Logic 1 = Transmitter is disabled
Logic 0 = Receiver is enabled
Logic 1 = Receiver is disabled
Extra Features Control Register (EFCR) - Read/Write
Baud Rate Generator Registers (DLL, DLM and DLD[3:0]) - Read/Write
DLD[5]
0
0
1
for complete details.
TWO CHANNEL I2C/SPI UART WITH 64-BYTE FIFO AND RS232 TRANSCEIVER
T
ABLE
14: S
SEE”PROGRAMMABLE BAUD RATE GENERATOR WITH
AMPLING
DLD[4]
35
X
0
1
R
“Section 2.16, Infrared Mode (UART Channel B
ATE
S
ELECT
Table 14
S
AMPLING
16X
8X
4X
XR20V2172
R
below.
ATE