參數(shù)資料
型號: C8051F018R
廠商: Silicon Laboratories Inc
文件頁數(shù): 18/154頁
文件大?。?/td> 0K
描述: IC 8051 MCU 16K FLASH 64TQFP
標(biāo)準包裝: 1
系列: C8051F018
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SMBus(2 線/I²C),SPI,UART/USART
外圍設(shè)備: 欠壓檢測/復(fù)位,POR,PWM,溫度傳感器,WDT
輸入/輸出數(shù): 32
程序存儲器容量: 16KB(16K x 8)
程序存儲器類型: 閃存
RAM 容量: 1.25K x 8
電壓 - 電源 (Vcc/Vdd): 2.8 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 8x10b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 64-TQFP
包裝: 剪切帶 (CT)
其它名稱: 336-1048-1
C8051F018
C8051F019
16.1.
UART Operational Modes
The UART provides four operating modes (one synchronous and three asynchronous) selected by setting
configuration bits in the SCON register. These four modes offer different baud rates and communication protocols.
The four modes are summarized in Table 16.1 below. Detailed descriptions follow.
Table 16.1. UART Modes
Mode
Synchronization
Baud Clock
Data Bits
Start/Stop Bits
0
Synchronous
SYSCLK/12
8
None
1
Asynchronous
Timer 1 or Timer 2 Overflow
8
1 Start, 1 Stop
2
Asynchronous
SYSCLK/32 or SYSCLK/64
9
1 Start, 1 Stop
3
Asynchronous
Timer 1 or Timer 2 Overflow
9
1 Start, 1 Stop
16.1.1. Mode 0: Synchronous Mode
Mode 0 provides synchronous, half-duplex communication. Serial data is transmitted and received on the RX pin.
The TX pin provides the shift clock for both transmit and receive. The MCU must be the master since it generates
the shift clock for transmission in both directions (see the interconnect diagram in Figure 16.2).
Eight data bits are transmitted/received, LSB first (see the timing diagram in Figure 16.3). Data transmission begins
when an instruction writes a data byte to the SBUF register. The TI Transmit Interrupt Flag (SCON.1) is set at the
end of the eighth bit time. Data reception begins when the REN Receive Enable bit (SCON.4) is set to logic 1 and
the RI Receive Interrupt Flag (SCON.0) is cleared. One cycle after the eighth bit is shifted in, the RI flag is set and
reception stops until software clears the RI bit. An interrupt will occur if enabled when either TI or RI is set.
The Mode 0 baud rate is the system clock frequency divided by twelve. RX is forced to open-drain in mode 0, and
an external pull-up will typically be required.
Figure 16.2. UART Mode 0 Interconnect
Shift
Reg.
CLK
C8051Fxxx
RX
TX
DATA
8 Extra Outputs
Figure 16.3. UART Mode 0 Timing Diagram
D1
D0
D2
D3
D4
D5
D6
D7
RX (data out)
MODE 0 TRANSMIT
D0
MODE 0 RECEIVE
RX (data in)
D1
D2
D3
D4
D5
D6
D7
TX (clk out)
Rev. 1.2
114
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