參數(shù)資料
型號(hào): C8051F2XX
廠商: Electronic Theatre Controls, Inc.
英文描述: Mixed Signal 8 kB ISP Flash MCU Family
中文描述: 混合信號(hào)8 KB的閃存MCU系列的ISP
文件頁(yè)數(shù): 124/146頁(yè)
文件大小: 1856K
代理商: C8051F2XX
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C8051F2xx
124
Rev. 1.6
SFR Definition 16.2. SCON: Serial Port Control
Bits7–6:
SM0–SM1: Serial Port Operation Mode.
These bits select the Serial Port Operation Mode.
Bit5:
SM2: Multiprocessor Communication Enable.
The function of this bit is dependent on the Serial Port Operation Mode.
Mode 0: No effect
Mode 1: Checks for valid stop bit.
0: Logic level of stop bit is ignored.
1: RI will only be activated if stop bit is logic level 1.
Mode 2 and 3: Multiprocessor Communications Enable.
0: Logic level of ninth bit is ignored.
1: RI is set and an interrupt is generated only when the ninth bit is logic 1.
REN: Receive Enable.
This bit enables/disables the UART receiver.
0: UART reception disabled.
1: UART reception enabled.
TB8: Ninth Transmission Bit.
The logic level of this bit will be assigned to the ninth transmission bit in Modes 2 and 3. It is
not used in Modes 0 and 1. Set or cleared by software as required.
RB8: Ninth Receive Bit.
The bit is assigned the logic level of the ninth bit received in Modes 2 and 3. In Mode 1, if
SM2 is logic 0, RB8 is assigned the logic level of the received stop bit. RB8 is not used in
Mode 0.
TI: Transmit Interrupt Flag.
Set by hardware when a byte of data has been transmitted by the UART (after the 8
th
bit in
Mode 0, or at the beginning of the stop bit in other modes). When the UART interrupt is
enabled, setting this bit causes the CPU to vector to the UART interrupt service routine.
This bit must be cleared manually by software
RI: Receive Interrupt Flag.
Set by hardware when a byte of data has been received by the UART (after the 8
th
bit in
Mode 0, or after the stop bit in other modes – see SM2 bit for exception). When the UART
interrupt is enabled, setting this bit causes the CPU to vector to the UART interrupt service
routine. This bit must be cleared manually by software.
Bit4:
Bit3:
Bit2:
Bit1:
Bit0:
R/W
SM0
Bit7
R/W
SM1
Bit6
R/W
SM2
Bit5
R/W
REN
Bit4
R/W
TB8
Bit3
R/W
RB8
Bit2
R/W
TI
Bit1
R/W
RI
Bit0
Reset Value
00000000
SFR Address:
0x98
(bit addressable)
SM0
0
0
1
1
SM1
0
1
0
1
Mode
Mode 0: Synchronous Mode
Mode 1: 8-Bit UART, Variable Baud Rate
Mode 2: 9-Bit UART, Fixed Baud Rate
Mode 3: 9-Bit UART, Variable Baud Rate
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