參數(shù)資料
型號： TL16C550CI
廠商： Texas Instruments, Inc.
英文描述： Asynchronous Communications Element With Autoflow Control(帶自動數(shù)據(jù)流控制異步通信器件)
中文描述： 異步通信元件與Autoflow技術(shù)控制（帶自動數(shù)據(jù)流控制異步通信器件）
文件頁數(shù)： 32/39頁
文件大?。?/td> 556K
代理商： TL16C550CI
TL16C550C, TL16C550CI
ASYNCHRONOUS COMMUNICATIONS ELEMENT
WITH AUTOFLOW CONTROL
SLLS177F
–
MARCH 1994
–
REVISED MARCH 2001
32
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
modem status register (MSR) (continued)
Bit 3: This bit is the change in data carrier detect (
DCD) indicator.
DCD indicates that the DCD input to
the chip has changed state since the last time it was read by the CPU. When
DCD is set and the modem
status interrupt is enabled, a modem status interrupt is generated.
Bit 4: This bit is the complement of the clear-to-send (CTS) input. When the ACE is in the diagnostic test
mode (LOOP [MCR4] = 1), this bit is equal to the MCR bit 1 (RTS).
Bit 5: This bit is the complement of the data set ready (DSR) input. When the ACE is in the diagnostic test
mode (LOOP [MCR4] = 1), this bit is equal to the MCR bit 0 (DTR).
Bit 6: This bit is the complement of the ring indicator (RI) input. When the ACE is in the diagnostic test mode
(LOOP [MCR4] = 1), this bit is equal to the MCR bit 2 (OUT1).
Bit 7: This bit is the complement of the data carrier detect (DCD) input. When the ACE is in the diagnostic
test mode (LOOP [MCR4] = 1), this bit is equal to the MCR bit 3 (OUT2).
programmable baud generator
The ACE contains a programmable baud generator that takes a clock input in the range between dc and 16 MHz
and divides it by a divisor in the range between 1 and (2
16
–
1). The output frequency of the baud generator is
sixteen times (16
×
) the baud rate. The formula for the divisor is:
divisor = XIN frequency input
÷
(desired baud rate
×
16)
Two 8-bit registers, called divisor latches, store the divisor in a 16-bit binary format. These divisor latches must
be loaded during initialization of the ACE in order to ensure desired operation of the baud generator. When either
of the divisor latches is loaded, a 16-bit baud counter is also loaded to prevent long counts on initial load.
Tables 9 and 10 illustrate the use of the baud generator with crystal frequencies of 1.8432 MHz and 3.072 MHz
respectively. For baud rates of 38.4 kbits/s and below, the error obtained is very small. The accuracy of the
selected baud rate is dependent on the selected crystal frequency (refer to Figure 23 for examples of typical
clock circuits).
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
TL16C550CIFN 功能描述:UART 接口集成電路 Sngl UART w/16-Byte FIFOs & Aut Flw Ctrl RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
TL16C550CIFNG4 功能描述:UART 接口集成電路 Sgl UART w/ 16-Byte FIFO RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
TL16C550CIFNR 功能描述:UART 接口集成電路 Sgl UART w/ 16-Byte FIFOs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
TL16C550CIFNRG4 功能描述:UART 接口集成電路 Sgl UART w/ 16-Byte FIFOs RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
TL16C550CIN 制造商:TI 制造商全稱:Texas Instruments 功能描述:ASYNCHRONOUS COMMUNICATIONS ELEMENT WITH AUTOFLOW CONTROL
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