TL16C550B Datasheet, PDF (30/35 Pages) Texas Instruments – ASYNCHRONOUS COMMUNICATIONS ELEMENT

TL16C550B, TL16C550BI
ASYNCHRONOUS COMMUNICATIONS ELEMENT
SLLS136B – JANUARY 1994 – REVISED AUGUST 1996
PRINCIPLES OF OPERATION
programmable baud generator (continued)
Table 9. Baud Rates Using a 3.072-MHz Crystal
DESIRED
BAUD RATE
50
75
110
134.5
150
300
600
1200
1800
2000
2400
3600
4800
7200
9600
19200
38400
DIVISOR USED
TO GENERATE
16 × CLOCK
3840
2560
1745
1428
1280
640
320
160
107
96
80
53
40
27
20
10
5
PERCENT ERROR
DIFFERENCE BETWEEN
DESIRED AND ACTUAL
0.026
0.034
0.312
0.628
1.23
Driver
External
XIN
Clock
Optional
Clock
Output
Optional
Driver
XOUT
VCC
C1
RP
Oscillator Clock
to Baud Generator
Logic
C2
XIN
Crystal
RX2
XOUT
VCC
Oscillator Clock
to Baud Generator
Logic
CRYSTAL
3.1 MHz
1.8 MHz
TYPICAL CRYSTAL OSCILLATOR NETWORK
RP
1 MΩ
RX2
1.5 kΩ
C1
10-30 pF
1 MΩ
1.5 kΩ
10-30 pF
C2
40-60 pF
40-60 pF
Figure 16. Typical Clock Circuits
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