參數(shù)資料
型號: C8051F005
廠商: Cygnal Technologies
英文描述: 25 MIPS,32k Flash,2.25k Ram,12bit ADC,64 Pin MCU(25 MIPS,32k 閃速存儲器,2.25k Ram,12位 ADC,64 腳 MCU)
中文描述: 25 MIPS的,32K閃存,2.25k羊,12位ADC,64引腳微控制器(25 MIPS的,32K的閃速存儲器,2.25k羊,12位ADC和64腳微控制器)
文件頁數(shù): 132/170頁
文件大?。?/td> 1294K
代理商: C8051F005
Page 132
CYGNAL Integrated Products, Inc.
2001
4.2001; Rev. 1.3
C8051F000/1/2/5/6/7
C8051F010/1/2/5/6/7
PRELIMINARY
Figure 18.5. UART Modes 1, 2, and 3 Interconnect Diagram
18.1.3. Mode 2: 9-Bit UART, Fixed Baud Rate
Mode 2 provides asynchronous, full-duplex communication using a total of eleven bits per data byte: a start bit, 8
data bits (LSB first), a programmable ninth data bit, and a stop bit. On transmit, the ninth data bit is determined by
the value in TB8 (SCON.3). It can be assigned the value of the parity flag P in the PSW or used in multiprocessor
communications. On receive, the ninth data bit goes into RB8 (SCON.2) and the stop bit is ignored.
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 transmission (the beginning of the stop-bit time). Data reception can begin
any time after the REN Receive Enable bit (SCON.4) is set to logic 1. After the stop bit is received, the data byte
will be loaded into the SBUF receive register if the following conditions are met: RI must be logic 0, and if SM2 is
logic 1, the 9
th
bit must be logic 1.
If these conditions are met, the eight bits of data are stored in SBUF, the ninth bit is stored in RB8 and the RI flag is
set. If these conditions are not met, SBUF and RB8 will not be loaded and the RI flag will not be set. An interrupt
will occur if enabled when either TI or RI are set.
The baud rate in Mode 2 is a direct function of the system clock frequency as follows:
Mode 2 Baud Rate = 2
SMOD
* (SYSCLK / 64).
The SMOD bit (PCON.7) selects whether to divide SYSCLK by 32 or 64. In the formula, 2 is raised to the power
SMOD, resulting in a baud rate of either 1/32 or 1/64
of the system clock frequency. On reset, the SMOD bit is logic
0, thus selecting the lower speed baud rate by default.
Figure 18.6. UART Modes 2 and 3 Timing Diagram
18.1.4. Mode 3: 9-Bit UART, Variable Baud Rate
Mode 3 is the same as Mode 2 in all respects except the baud rate is variable. The baud rate is determined in the
same manner as for Mode 1. Mode 3 operation transmits 11 bits: a start bit, 8 data bits (LSB first), a programmable
ninth data bit, and a stop bit. Timer 1 or Timer 2 overflows generate the baud rate just as with Mode 1. In summary,
Mode 3 transmits using the same protocol as Mode 2 but with Mode 1 baud rate generation.
D1
D0
D2
D3
D4
D5
D6
D7
START
BIT
MARK
STOP
BIT
BIT TIMES
BIT SAMPLING
SPACE
D8
OR
RS-232
C8051Fxxx
RS-232
LEVEL
XLTR
TX
RX
C8051Fxxx
RX
TX
MCU
RX
TX
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
C8051F005/0046 制造商:Silicon Laboratories Inc 功能描述:
C8051F005DK 功能描述:開發(fā)板和工具包 - 8051 MCU DEVELOPMENT KIT W/ US POWER SUPPLY RoHS:否 制造商:Silicon Labs 產(chǎn)品:Development Kits 工具用于評估:C8051F960, Si7005 核心: 接口類型:USB 工作電源電壓:
C8051F005DK-A 功能描述:DEV KIT FOR C8051F005/F006/F007 RoHS:否 類別:編程器,開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:MCU 適用于相關(guān)產(chǎn)品:Freescale MC68HC908LJ/LK(80-QFP ZIF 插口) 所含物品:面板、纜線、軟件、數(shù)據(jù)表和用戶手冊 其它名稱:520-1035
C8051F005DK-B 功能描述:DEV KIT FOR C8051F005/F006/F007 RoHS:否 類別:編程器,開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:MCU 適用于相關(guān)產(chǎn)品:Freescale MC68HC908LJ/LK(80-QFP ZIF 插口) 所含物品:面板、纜線、軟件、數(shù)據(jù)表和用戶手冊 其它名稱:520-1035
C8051F005DK-E 功能描述:DEV KIT FOR C8051F005/F006/F007 RoHS:否 類別:編程器,開發(fā)系統(tǒng) >> 過時/停產(chǎn)零件編號 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:MCU 適用于相關(guān)產(chǎn)品:Freescale MC68HC908LJ/LK(80-QFP ZIF 插口) 所含物品:面板、纜線、軟件、數(shù)據(jù)表和用戶手冊 其它名稱:520-1035