參數(shù)資料
型號(hào): ST10F269Z2Q3
廠商: STMICROELECTRONICS
元件分類: 微控制器/微處理器
英文描述: 16-BIT, FLASH, 40 MHz, MICROCONTROLLER, PQFP144
封裝: 28 X 28 MM, PLASTIC, QFP-144
文件頁數(shù): 157/160頁
文件大?。?/td> 1541K
代理商: ST10F269Z2Q3
ST10F269
96/160
Baud Rate Generation
The Baud rate generator is clocked by fCPU/2. The
timer is counting downwards and can be started
or stopped through the global enable bit SSCEN
in register SSCCON. Register SSCBR is the
dual-function
Baud
Rate
Generator/Reload
register. Reading SSCBR, while the SSC is
enabled, returns the content of the timer. Reading
SSCBR, while the SSC is disabled, returns the
programmed reload value. In this mode the
desired reload value can be written to SSCBR.
Note
Never write to SSCBR, while the SSC is
enabled.
The formulas below calculate the resulting Baud
rate for a given reload value and the required
reload value for a given Baud rate:
(SSCBR) represents the content of the reload
register, taken as unsigned 16-bit integer.
Table 25 lists some possible Baud rates against
the required reload values and the resulting bit
times for a 40MHz CPU clock.
Baud rateSSC =
fCPU
2 x [(SSCBR) + 1]
SSCBR = (
fCPU
2 x Baud rateSSC
) - 1
Table 25 : Synchronous Baud Rate and Reload
Values
Baud Rate
Bit Time
Reload Value
Reserved use a
reload value > 0.
---
10M Baud
100ns
0001h
5M Baud
200ns
0003h
2.5M Baud
400ns
0007h
1M Baud
1
s
0013h
100K Baud
10
s
00C7h
10K Baud
100
s
07CFh
1K Baud
1ms
4E1Fh
306 Baud
3.26ms
FF4Eh
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