TL16PIR552 Datasheet, PDF (37/52 Pages) Texas Instruments – DUAL UART WITH DUAL IrDA AND 1284 PARALLEL PORT

Driver
External
XIN
Clock
Optional
Clock
Output
Optional
Driver
XOUT
TL16PIR552
DUAL UART WITH DUAL IrDA AND
1284 PARALLEL PORT
SLLS222A – DECEMBER 1995 – REVISED AUGUST 1996
PRINCIPLES OF OPERATION
Table 12. 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 OF ERROR
DIFFERENCE BETWEEN
DESIRED AND ACTUAL
BAUD RATES
0.026
0.034
0.312
0.628
1.23
VCC
C1
RP
Oscillator Clock
to Baud-Generator
Logic
C2
XIN
Crystal
RX2
XOUT
VCC
Oscillator Clock
to Baud-Generator
Logic
CRYSTAL
3.072 MHz
1.8432 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 26. Typical Clock Circuits
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