參數(shù)資料
型號(hào): C8051F221
廠商: Silicon Laboratories Inc
文件頁數(shù): 22/146頁
文件大?。?/td> 0K
描述: IC 8051 MCU 8K FLASH 32LQFP
標(biāo)準(zhǔn)包裝: 250
系列: C8051F2xx
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SPI,UART/USART
外圍設(shè)備: 欠壓檢測(cè)/復(fù)位,POR,WDT
輸入/輸出數(shù): 22
程序存儲(chǔ)器容量: 8KB(8K x 8)
程序存儲(chǔ)器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
數(shù)據(jù)轉(zhuǎn)換器: A/D 22x8b
振蕩器型: 內(nèi)部
工作溫度: -40°C ~ 85°C
封裝/外殼: 32-LQFP
包裝: 托盤
C8051F2xx
118
Rev. 1.6
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.
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
Eight data bits are transmitted/received, LSB first (see the timing diagram in Figure 16.3). Data transmis-
sion 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 are set.
The Mode 0 baud rate is system clock frequency divided by twelve.
Figure 16.2. UART Mode 0 Interconnect
Figure 16.3. UART Mode 0 Timing Diagram
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
Shift
Reg.
CLK
C8051Fxxx
RX
TX
DATA
8 Extra Outputs
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)
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