参数资料
型号: ST10F269Z2Q3
厂商: STMICROELECTRONICS
元件分类: 微控制器/微处理器
英文描述: 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP144
封装: 28 X 28 MM, PLASTIC, QFP-144
文件页数: 153/160页
文件大小: 1541K
代理商: ST10F269Z2Q3
ST10F269
92/160
Asynchronous Mode Baud rates
For asynchronous operation, the Baud rate
generator provides a clock with 16 times the rate
of the established Baud rate. Every received bit is
sampled at the 7th, 8th and 9th cycle of this clock.
The Baud rate for asynchronous operation of
serial channel ASC0 and the required reload
value for a given Baud rate can be determined by
the following formulas:
(S0BRL) represents the content of the reload
register, taken as unsigned 13-bit integer,
(S0BRS) represents the value of bit S0BRS (‘0’ or
‘1’), taken as integer.
Using the above equation, the maximum Baud
rate can be calculated for any given clock speed.
Baud rate versus reload register value (SOBRS=0
and SOBRS=1) is described in Table 23.
Note: The deviation errors given in the Table 23 are rounded. To avoid deviation errors use a Baud rate
crystal (providing a multiple of the ASC0/SSC sampling frequency).
BAsync =
fCPU
16 x [2 + (S0BRS)] x [(S0BRL) + 1]
S0BRL = (
fCPU
16 x [2 + (S0BRS)] x BAsync
) - 1
Table 23 : Commonly Used Baud Rates by Reload Value and Deviation Errors
S0BRS = ‘0’, fCPU = 40MHz
S0BRS = ‘1’, fCPU = 40MHz
Baud Rate (Baud)
Deviation Error
Reload Value
(hexa)
Baud Rate (Baud)
Deviation Error
Reload Value
(hexa)
1 250 000
0.0% / 0.0%
0000 / 0000
833 333
0.0% / 0.0%
0000 / 0000
112 000
+1.5% / -7.0%
000A / 000B
112 000
+6.3% / -7.0%
0006 / 0007
56 000
+1.5% / -3.0%
0015 / 0016
56 000
+6.3% / -0.8%
000D / 000E
38 400
+1.7% / -1.4%
001F / 0020
38 400
+3.3% / -1.4%
0014 / 0015
19 200
+0.2% / -1.4%
0040 / 0041
19 200
+0.9% / -1.4%
002A / 002B
9 600
+0.2% / -0.6%
0081 / 0082
9 600
+0.9% / -0.2%
0055 / 0056
4 800
+0.2% / -0.2%
0103 / 0104
4 800
+0.4% / -0.2%
00AC / 00AD
2 400
+0.2% / -0.0%
0207 / 0208
2 400
+0.1% / -0.2%
015A / 015B
1 200
0.1% / 0.0%
0410 / 0411
1 200
+0.1% / -0.1%
02B5 / 02B6
600
0.0% / 0.0%
0822 / 0823
600
+0.1% / -0.0%
056B / 056C
300
0.0% / 0.0%
1045 / 1046
300
0.0% / 0.0%
0AD8 / 0AD9
153
0.0% / 0.0%
1FE8 / 1FE9
102
0.0% / 0.0%
1FE8 / 1FE9
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