參數(shù)資料
型號(hào): GMS90L320
英文描述: 8-Bit Single-Chip Microcontrollers(低電壓,8位單片微控制器)
中文描述: 8位單芯片微控制器(低電壓,8位單片微控制器)
文件頁(yè)數(shù): 21/46頁(yè)
文件大?。?/td> 683K
代理商: GMS90L320
GMS90C320
OCT. 2000 Ver 1.2
17
Serial Interface (USART)
The serial portisfullduplex and can operatein four modes (one synchronousmode, three asynchronous modes)as illustrated
in
Table 6
. The possible baud rates can be calculated using the formulas given in
Table 7
.
Table 6
USART Operating Modes
Mode
SCON
Baudrate
Description
SM0
SM1
0
0
0
Serial data enters and exits through RxD.
TxD 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 TxD) or
received (RxD)
2
1
0
or
9-bit UART
11 bits are transmitted (through TxD) or
received (RxD)
3
1
1
Timer 1/2 overflow rate
9-bit UART
Like mode 2 except the variable baud rate
Table 7
Formulas for Calculating Baud rates
Baud Rate
derived from
Interface Mode
Baud rate
Oscillator
0
2
Timer 1 (16-bit timer)
(8-bit timer with 8-bit autore-
load)
1, 3
1, 3
Timer 2
1, 3
---------------
---------------
---------------
---------------
------------------------------------------
--------------------------------------------------------------------------------
12
256
32
TH1
)
----------------------------------------------------------
32
65536
RC2H,RC2L
)
]
--------------------------------–
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