xr16m698 Exar Corporation, xr16m698 Datasheet - Page 38

• Manufacturer Part Number: xr16m698
• Description: 1.62v To 3.63v High Performance Octal Uart With 32-byte Fifo
• Manufacturer: Exar Corporation

XR16M698
1.62V TO 3.63V HIGH PERFORMANCE OCTAL UART WITH 32-BYTE FIFO
LCR[7]: Baud Rate Divisors Enable
Baud rate generator divisor (DLL, DLM, DLD) enable.
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LCR[6]: Transmit Break Enable
When enabled the Break control bit causes a break condition to be transmitted (the TX output is forced to a
“space’, logic 0, state). This condition remains until disabled by setting LCR bit-6 to a logic 0.
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LCR[5]: TX and RX Parity Select
If the parity bit is enabled, LCR BIT-5 selects the forced parity format.
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LCR[4]: TX and RX Parity Select
If the parity bit is enabled with LCR bit-3 set to a logic 1, LCR BIT-4 selects the even or odd parity format.
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LCR[3]: TX and RX Parity Select
Parity or no parity can be selected via this bit. The parity bit is a simple way used in communications for data
integrity check. See
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Logic 0 = Data registers are selected (default).
Logic 1 = Divisor latch registers (DLL, DLM and DLD) are selected.
Logic 0 = No TX break condition. (default)
Logic 1 = Forces the transmitter output (TX) to a “space”, logic 0, for alerting the remote receiver of a line
break condition.
LCR BIT-5 = logic 0, parity is not forced (default).
LCR BIT-5 = logic 1 and LCR BIT-4 = logic 0, parity bit is forced to a logical 1 for the transmit and receive
data.
LCR BIT-5 = logic 1 and LCR BIT-4 = logic 1, parity bit is forced to a logical 0 for the transmit and receive
data.
Logic 0 = ODD Parity is generated by forcing an odd number of logic 1’s in the transmitted character. The
receiver must be programmed to check the same format (default).
Logic 1 = EVEN Parity is generated by forcing an even the number of logic 1’s in the transmitted character.
The receiver must be programmed to check the same format.
Logic 0 = No parity.
Logic 1 = A parity bit is generated during the transmission while the receiver checks for parity error of the
data character received.
LCR B
Table 16
X
0
0
1
1
IT
-5
above for parity selection summary.
LCR B
T
X
0
1
0
1
ABLE
IT
-4
16: P
LCR B
ARITY
0
1
1
1
1
38
IT
P
-3
ROGRAMMING
Force parity to space, “0”
Force parity to mark, “1”
P
ARITY SELECTION
Even parity
Odd parity
No parity
REV. 1.0.0