參數(shù)資料
型號: ATWEBDVK-02VOIP
廠商: Atmel
文件頁數(shù): 87/137頁
文件大?。?/td> 0K
描述: KIT DEV TCP/IP AT89C51RD2 VOIP
標準包裝: 1
系列: @Web
主要目的: *
嵌入式: *
已用 IC / 零件: AT89C51RD2
主要屬性: *
次要屬性: *
已供物品: 板,帶 VoIP 模塊和軟件
產(chǎn)品目錄頁面: 617 (CN2011-ZH PDF)
53
4235K–8051–05/08
AT89C51RD2/ED2
Table 14-4.
SCON Register
SCON - Serial Control Register (98h)
Reset Value = 0000 0000b
Bit addressable
7
6
5
4
3
2
1
0
FE/SM0
SM1
SM2
REN
TB8
RB8
TI
RI
Bit
Number
Bit
Mnemonic
Description
7
FE
Framing Error bit (SMOD0=1)
Clear to reset the error state, not cleared by a valid stop bit.
Set by hardware when an invalid stop bit is detected.
SMOD0 must be set to enable access to the FE bit.
SM0
Serial port Mode bit 0
Refer to SM1 for serial port mode selection.
SMOD0 must be cleared to enable access to the SM0 bit.
6
SM1
Serial port Mode bit 1
SM0SM1Mode
Baud Rate
0
0 Shift Register
F
XTAL/12 (or FXTAL /6 in mode X2)
0
1 8-bit UART
Variable
1
0 9-bit UARTF
XTAL/64 or FXTAL/32
1
1 9-bit UARTVariable
5
SM2
Serial port Mode 2 bit / Multiprocessor Communication Enable bit
Clear to disable multiprocessor communication feature.
Set to enable multiprocessor communication feature in mode 2 and 3, and
eventually mode 1.This bit should be cleared in mode 0.
4
REN
Reception Enable bit
Clear to disable serial reception.
Set to enable serial reception.
3
TB8
Transmitter Bit 8 / Ninth bit to transmit in modes 2 and 3
Clear to transmit a logic 0 in the 9th bit.
Set to transmit a logic 1 in the 9th bit.
2
RB8
Receiver Bit 8 / Ninth bit received in modes 2 and 3
Cleared by hardware if 9th bit received is a logic 0.
Set by hardware if 9th bit received is a logic 1.
In mode 1, if SM2 = 0, RB8 is the received stop bit. In mode 0 RB8 is not used.
1
TI
Transmit Interrupt flag
Clear to acknowledge interrupt.
Set by hardware at the end of the 8th bit time in mode 0 or at the beginning of the
stop bit in the other modes.
0
RI
Receive Interrupt flag
Clear to acknowledge interrupt.
Set by hardware at the end of the 8th bit time in mode 0, see Figure 14-2. and
Figure 14-3. in the other modes.
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