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UPSD3422 Datasheet(PDF) 104 Page - STMicroelectronics

Part # UPSD3422
Description  Turbo Plus series Fast Turbo 8032 MCU with USB and programmable logic
PDF  300 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

UPSD3422 Datasheet(HTML) 104 Page - STMicroelectronics

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Standard 8032 timer/counters
UPSD3422, UPSD3433, UPSD3434, UPSD3454
104/300
in use as a baud rate generator, the pin T2X can be used as an extra external interrupt, if
desired.
When Timer 2 is running (TR2 = 1) in a “timer” function in the Baud rate generator mode,
firmware should not read or write TH2 or TL2. Under these conditions the results of a read
or write may not be accurate. However, SFRs RCAP2H and RCAP2L may be read, but
should not be written, because a write might overlap a reload and cause write and/or reload
errors. Timer 2 should be turned off (clear TR2) before accessing Timer 2 or registers
RCAP2H and RCAP2L, in this case.
Table 63 on page 104 shows commonly used baud rates and how they can be obtained
from Timer 2, with T2CON = 34h.
Table 63.
Commonly used baud rates generated from timer2
(T2CON = 34h)
fOSC MHz
Desired
baud rate
Timer 2 SFRs
Resulting baud
rate
Baud rate
deviation
RCAP2H (hex)
RCAP2L(hex)
40.0
115200
FF
F5
113636
-1.36%
40.0
57600
FF
EA
56818
-1.36%
40.0
28800
FF
D5
29070
0.94%
40.0
19200
FF
BF
19231
0.16%
40.0
9600
FF
7E
9615
0.16%
36.864
115200
FF
F6
115200
0
36.864
57600
FF
EC
57600
0
36.864
28800
FF
D8
28800
0
36.864
19200
FF
C4
19200
0
36.864
9600
FF
88
9600
0
36.0
28800
FF
D9
28846
0.16%
36.0
19200
FF
C5
19067
-0.69%
36.0
9600
FF
8B
9615
0.16%
24.0
57600
FF
F3
57692
0.16%
24.0
28800
FF
E6
28846
0.16%
24.0
19200
FF
D9
19231
0.16%
24.0
9600
FF
B2
9615
0.16%
12.0
28800
FF
F3
28846
0.16%
12.0
9600
FF
D9
9615
0.16%
11.0592
115200
FF
FD
115200
0
11.0592
57600
FF
FA
57600
0
11.0592
28800
FF
F4
28800
0
11.0592
19200
FF
EE
19200
0
11.0592
9600
FF
DC
9600
0
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