參數(shù)資料
型號： SAK-C505L
廠商： INFINEON TECHNOLOGIES AG
元件分類： 8位微控制器
英文描述： 8-bit CMOS Microcontroller
中文描述： 8位CMOS微控制器
文件頁數(shù)： 36/85頁
文件大?。?/td> 487K
代理商： SAK-C505L
C505L
Data Sheet
34
06.99
Serial Interface (USART)
The serial port is full duplex and can operate in four modes (one synchronous mode, three
asynchronous modes) as illustrated in
Table 7
.
For clarification some terms regarding the difference between “baud rate clock” and “baud rate”
should be mentioned. In the asynchronous modes the serial interfaces require a clock rate which is
16 times the baud rate for internal synchronization. Therefore, the baud rate generators/timers have
to provide a “baud rate clock” (output signal in
Figure 15
) to the serial interface which - divided by
16 - results in the actual “baud rate”. Further, the abbrevation
f
OSC
refers to the oscillator frequency
(crystal or external clock operation).
The variable baud rates for modes 1 and 3 of the serial interface can be derived either from timer 1
or from a dedicated baud rate generator (see
Figure 15
).
Table 7
USART Operating Modes
Mode
SCON
Description
SM0
SM1
0
0
0
Shift register mode, fixed baud rate
Serial data enters and exits through R
×
D; T
×
D outputs the shift clock;
8-bit are transmitted/received (LSB first)
1
0
1
8-bit UART, variable baud rate
10 bits are transmitted (through T
×
D) or received (at R
×
D)
9-bit UART, fixed baud rate
11 bits are transmitted (through T
×
D) or received (at R
×
D)
9-bit UART, variable baud rate
Like mode 2
2
1
0
3
1
1
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