參數(shù)資料
型號(hào)： C508
廠商： Electronic Theatre Controls, Inc.
英文描述： Previous Vectron Model Numbers
中文描述： 前Vectron型號(hào)
文件頁數(shù)： 44/93頁
文件大?。?/td> 1204K
代理商： C508
C508
Data Sheet
40
2000-08
Baud Rate Generation
There are several possibilities to generate the baud rate clock for the serial port
depending on the mode in which it is operating.
Figure 18
Baud Rate Generation for the Serial Port
For clarification, some terms regarding the difference between “baud rate clock” and
“baud rate” should be mentioned. The serial interface requires a clock rate which is
16 times the baud rate for internal synchronization. Therefore, the baud rate generators
must provide a “baud rate clock” to the serial interface which - there divided by 16 -
results in the actual “baud rate”. However, all formulas given in the following section
already include the factor and calculate the final baud rate. Further, the abbreviation
f
OSC
refers to the external clock frequency (oscillator or external input clock operation).
Depending on the programmed operating mode different paths are selected for the baud
rate clock generation.
Figure 18
shows the dependencies of the serial port baud rate
clock generation on the two control bits and from the mode which is selected in the
special function register SCON.
MCS04074
SCON.7/
SCON.6
(SM0/SM1)
Mode 1
Mode 3
Mode 2
Mode 0
2
f
OSC
Timer 1 Overflow
Only one mode
can be selected
PCON.7
(SMOD)
÷
2
Baudrate
Clock
0
1
Note: The switch configuration shows the reset state
ADCON0.7
(BD)
0
1
Baudrate
Generator
(SRELH
SRELL)
÷
6
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