參數(shù)資料
型號: HMS99C58S
廠商: Electronic Theatre Controls, Inc.
英文描述: 8-BIT SINGLE-CHIP MICROCONTROLLERS WITH EMBEDDED FLASH
中文描述: 8位單片機與嵌入式閃存微控制器
文件頁數(shù): 27/73頁
文件大?。?/td> 696K
代理商: HMS99C58S
HMS99C51S/52S/54S/56S/58S
Sep. 2004 Ver 1.01
23
SERIAL INTERFACE (UART)
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.
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 6. UART Operating Modes
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
Table 7. Formulas for Calculating Baud rates
f
12
------------
f
32
------------
f
64
------------
f
12
------------
SMOD
64
------------------
f
OSC
×
SMOD
32
------------------
Timer 1 overflow
(
)
×
SMOD
32
------------------
f
256
12
TH1
)
]
--------------------------------------------------
×
f
RC2H RC2L
(
32
65536
)
[
]
×
---------------------------------------------------------------------------------
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