xr16m698 Exar Corporation, xr16m698 Datasheet - Page 11

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

REV. 1.0.0
The transmitter section comprises of an 8-bit Transmit Shift Register (TSR) and 32 bytes of FIFO which
includes a byte-wide Transmit Holding Register (THR). TSR shifts out every data bit with the 16X or 8X or 4X (if
8X or 4X sampling is selected via the
(or 8 or 4) clock periods. The transmitter sends the start-bit followed by the number of data bits, inserts the
proper parity-bit if enabled, and adds the stop-bit(s). The status of the FIFO and TSR are reported in the Line
Status Register (LSR bit-5 and bit-6).
2.7
Output Data
Required
1000000
100000
115200
153600
200000
225000
230400
250000
300000
400000
460800
500000
750000
921600
10000
19200
25000
28800
38400
50000
57600
75000
Rate
2400
4800
9600
400
Transmitter
T
ABLE
5: T
D
IVISOR FOR
YPICAL DATA RATES WITH A
(Decimal)
52.0833
39.0625
26.0417
13.0208
156.25
78.125
9.7656
6.6667
6.5104
3.2552
1.6276
Clock
312.5
3750
3.75
625
150
7.5
1.5
60
30
20
15
6
5
3
2
16x
1.62V TO 3.63V HIGH PERFORMANCE OCTAL UART WITH 32-BYTE FIFO
O
BTAINABLE IN
312 8/16
156 4/16
78 2/16
52 1/16
39 1/16
26 1/16
D
9 12/16
6 11/16
3 12/16
1 10/16
7 8/16
6 8/16
3 4/16
1 8/16
8XMODE Register
3750
IVISOR
698
625
150
60
30
20
15
13
6
5
3
2
24 MH
DLM P
V
ALUE
Z CRYSTAL OR EXTERNAL CLOCK AT
11
E
ROGRAM
2
1
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
(HEX)
or 4XMODE Register) internal clock. A bit time is 16
DLL P
V
ALUE
A6
9C
4E
3C
1E
1A
71
38
96
34
27
14
D
F
9
7
6
6
6
5
3
3
3
2
1
1
ROGRAM
(HEX)
DLD P
V
ALUE
16X S
C
C
ROGRAM
B
A
0
0
8
4
0
2
0
1
1
0
1
0
0
0
8
8
0
0
4
0
0
8
(HEX))
AMPLING
XR16M698
D
ATA
R
ATE
0.04
0.08
0.16
0.16
0.31
0.16
0.16
0.16
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
E
RROR
(%)