參數(shù)資料
型號: C8051F305-GS
廠商: Silicon Laboratories Inc
文件頁數(shù): 37/178頁
文件大?。?/td> 0K
描述: IC 8051 MCU 2K FLASH 14-SOIC
產(chǎn)品培訓模塊: Serial Communication Overview
標準包裝: 56
系列: C8051F30x
核心處理器: 8051
芯體尺寸: 8-位
速度: 25MHz
連通性: SMBus(2 線/I²C),UART/USART
外圍設備: POR,PWM,WDT
輸入/輸出數(shù): 8
程序存儲器容量: 2KB(2K x 8)
程序存儲器類型: 閃存
RAM 容量: 256 x 8
電壓 - 電源 (Vcc/Vdd): 2.7 V ~ 3.6 V
振蕩器型: 外部
工作溫度: -40°C ~ 85°C
封裝/外殼: 14-SOIC(0.154",3.90mm 寬)
包裝: 管件
產(chǎn)品目錄頁面: 622 (CN2011-ZH PDF)
配用: 336-1444-ND - ADAPTER PROGRAM TOOLSTICK F300
其它名稱: 336-1540-5
Rev. 2.9
131
C8051F300/1/2/3/4/5
14. UART0
UART0 is an asynchronous, full duplex serial port offering modes 1 and 3 of the standard 8051 UART.
Enhanced baud rate support allows a wide range of clock sources to generate standard baud rates (details
UART0 to start reception of a second incoming data byte before software has finished reading the previous
data byte.
UART0 has two associated SFRs: Serial Control Register 0 (SCON0) and Serial Data Buffer 0 (SBUF0).
The single SBUF0 location provides access to both transmit and receive registers. Reading SBUF0
accesses the buffered Receive register; writing SBUF0 accesses the Transmit register.
With UART0 interrupts enabled, an interrupt is generated each time a transmit is completed (TI0 is set in
SCON0), or a data byte has been received (RI0 is set in SCON0). The UART0 interrupt flags are not
cleared by hardware when the CPU vectors to the interrupt service routine. They must be cleared manually
by software, allowing software to determine the cause of the UART0 interrupt (transmit complete or receive
complete).
UART Baud
Rate Generator
RI
SCON0
RI0
TI0
RB
8
0
TB
8
0
RE
N0
MCE
0
S0M
O
DE
Tx Control
Tx Clock
Send
SBUF
(TX Shift)
Start
Data
Write to
SBUF
Crossbar
TX
Shift
Zero Detector
Tx IRQ
SET
Q
D
CLR
Stop Bit
TB8
SFR Bus
Serial
Port
Interrupt
TI
Port I/O
Rx Control
Start
Rx Clock
Load
SBUF
Shift
0x1FF
RB8
Rx IRQ
Input Shift Register
(9 bits)
Load SBUF0
Read
SBUF
SFR Bus
Crossbar
RX
SBUF
(RX Latch)
Figure 14.1. UART0 Block Diagram
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