參數(shù)資料
型號: GMS90L31
英文描述: 8-Bit CMOS Microcontrollers(高性價比的51單片機,片內(nèi)無ROM,128字節(jié)RAM,低電壓)
中文描述: 8位CMOS微控制器(高性價比的51單片機,片內(nèi)無光盤,128字節(jié)的RAM,低電壓)
文件頁數(shù): 21/59頁
文件大?。?/td> 812K
代理商: GMS90L31
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 baud rates can be calculated using the formulas given in
table 7.
Table 6
USART Operating Modes
Mode
SCON
Baud rate
Description
SM0
SM1
0
0
0
f
OSC
/ 12
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
f
OSC
/ 32 or
f
OSC
/ 64
9-bit UART
11bits are transmitted (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
f
OSC
/ 12
(2
SMOD
f
OSC)
/ 64
Timer 1 (16-bit timer)
(8-bit timer with
8-bit autoreload)
1,3
1,3
(2
SMOD
timer 1 overflow rate) /32
(2
SMOD
f
OSC )
/(32
12
(256-TH1))
Timer2
1,3
f
OSC
/ (32
(65536-(RC2H, RC2L)
8-Bit CMOS Microcontroller
GMS90 Series
MAY. 1998
21
LG Semicon MCU
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