XR16L784_08 Datasheet, PDF (31/51 Pages) Exar Corporation – HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART

REV. 1.2.3
XR16L784
HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
TRIGGER
TABLE
Table-A
Table-B
Table-C
Table-D
TABLE 14: TRANSMIT AND RECEIVE FIFO TRIGGER TABLE AND LEVEL SELECTION
FCTR FCTR FCR
BIT-7 BIT-6 BIT-7
FCR
BIT-6
FCR
BIT-5
FCR
RECEIVE
BIT-4 TRIGGER LEVEL
TRANSMIT
TRIGGER
LEVEL
COMPATIBILITY
0
0
0
0
1 (default) 16C550, 16C2550,
0
0
0
1
1 (default)
4
16C2552, 16C554,
16C580
1
0
8
1
1
14
0
1
0
0
0
1
1
0
1
1
0
0
8
0
1
16
1
0
24
1
1
28
16
16C650A
8
24
30
1
0
0
0
0
1
1
0
1
1
0
0
8
0
1
16
1
0
56
1
1
60
8
16C654
16
32
56
1
1
X
X
X
X Programmable Programmable 16L2752, 16L2750,
via RXTRG
register.
via TXTRG ^{16C2852, 16C850,}
register. ^{16C854, 16C864}
4.6 Line Control Register (LCR) - Read/Write
The Line Control Register is used to specify the asynchronous data communication format. The word or
character length, the number of stop bits, and the parity are selected by writing the appropriate bits in this
register.
LCR[1:0]: TX and RX Word Length Select
These two bits specify the word length to be transmitted or received.
BIT-1
0
0
1
1
BIT-0
0
1
0
1
WORD LENGTH
5 (default)
6
7
8
31