參數(shù)資料
型號: Q67127-C1032
廠商: SIEMENS 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): 21/48頁
文件大?。?/td> 319K
代理商: Q67127-C1032
Semiconductor Group
21
1997-04-01
C501
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 6
. The possible baudrates can be calculated using the
formulas given in
table 7
.
Table 6
USART Operating Modes
Mode
SCON
Baudrate
Description
SM0
SM1
0
0
0
f
OSC
/12
Serial data enters and exits through R
×
D.
T
×
D outputs the shift clock. 8-bit are
transmitted/received (LSB first)
1
0
1
Timer 1/2 overflow rate
8-bit UART
10 bits are transmitted (through T
×
D) or
received (R
×
D)
9-bit UART
11 bits are transmitted (T
×
D) or
received (R
×
D)
9-bit UART
Like mode 2 except the variable baud rate
2
1
0
f
OSC
/32 or
f
OSC
/64
3
1
1
Timer 1/2 overflow rate
Table 7
Formulas for Calculating Baudrates
Baud Rate
derived from
Interface Mode
Baudrate
Oscillator
0
2
f
OSC
/12
(2
SMOD
×
f
OSC
) / 64
(2
SMOD
×
timer 1 overflow rate) /32
(2
SMOD
×
f
OSC
) / (32
×
12
×
(256-TH1))
Timer 1 (16-bit timer)
(8-bit timer with
8-bit autoreload)
1,3
1,3
Timer 2
1,3
f
OSC
/ (32
×
(65536-(RC2H, RC2L))
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