參數(shù)資料
型號: HMS99C52
廠商: Hynix Semiconductor Inc.
元件分類: 8位微控制器
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS
中文描述: 8位單晶片微控制器
文件頁數(shù): 24/43頁
文件大?。?/td> 533K
代理商: HMS99C52
HMS99C5X Series
20
Jan. 2003 Ver 1.0
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
Baudrate
Description
SM0
SM1
0
0
0
Serial data enters and exits through RxD.
TxD outputs the shift clock. 8-bit are transmit-
ted/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 (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
Baudrate
Oscillator
0
2
Timer 1 (16-bit timer)
(8-bit timer with
8-bit auto reload)
1,3
1,3
Timer 2
1,3
f
12
------------
f
32
------------
f
64
------------
f
12
------------
SMOD
64
------------------
f
OSC
×
SMOD
32
------------------
Timer 1 overflow
(
)
×
SMOD
32
------------------
f
256
12
TH1
(
)
D
[
]
×
---------------------------------------------------
×
f
(
D
32
65536
RC2H RC2L
)
[
]
×
----------------------------------------------------------------------------------
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