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參數(shù)資料
| 型號： | TL16C554I |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ASYNCHRONOUS COMMUNICATIONS ELEMENT |
| 中文描述： | 異步通信元 |
| 文件頁數(shù)： | 25/33頁 |
| 文件大?。?/td> | 478K |
| 代理商： | TL16C554I |
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TL16C554, TL16C554I
ASYNCHRONOUS COMMUNICATIONS ELEMENT
SLLS165D – JANUARY 1994 – REVISED JULY 1998
25
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
modem status register (MSR) (continued)
Table 7. Modem Status Register BIts
MSR BIT
MNEMONIC
CTS
DSR
TERI
DCD
CTS
DESCRIPTION
MSR0
Delta clear to send
MSR1
Delta data set ready
MSR2
Trailing edge of ring indicator
MSR3
Delta data carrier detect
MSR4
Clear to send
MSR5
DSR
Data set ready
MSR6
RI
Ring indicator
MSR7
DCD
Data carrier detect
programming
The serial channel of the ACE is programmed by the control registers LCR, IER, DLL, DLM, MCR, and FCR.
These control words define the character length, number of stop bits, parity, baud rate, and modem interface.
While the control registers can be written in any order, the IER should be written last because it controls the
interrupt enables. Once the serial channel is programmed and operational, these registers can be updated any
time the ACE serial channel is not transmitting or receiving data.
programmable baud rate generator
The ACE serial channel contains a programmable baud rate generator (BRG) that divides the clock (dc to
8 MHz) by any divisor from 1 to (2
16
–1). Two 8-bit divisor latch registers store the divisor in a 16-bit binary
format. These divisor latch registers must be loaded during initialization. Upon loading either of the divisor
latches, a 16-bit baud counter is immediately loaded. This prevents long counts on initial load. The BRG can
use any of three different popular frequencies to provide standard baud rates. These frequencies are 1.8432
MHz, 3.072 MHz, and 8 MHz. With these frequencies, standard bit rates from 50 kbps to 512 kbps are available.
Tables 8, 9, 10, and 11 illustrate the divisors needed to obtain standard rates using these three frequencies. The
output frequency of the baud rate generator is 16
×
the data rate [divisor # = clock + (baud rate
×
16)] referred
to in this document as RCLK.
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TL16C554IFN | 功能描述:UART 接口集成電路 Quad UART with 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 |
| TL16C554IFNG4 | 功能描述:UART 接口集成電路 Quad 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 |
| TL16C554IFNR | 功能描述:UART 接口集成電路 Quad UART with 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 |
| TL16C554IFNRG4 | 功能描述:UART 接口集成電路 Quad 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 |
| TL16C554IPN | 功能描述:UART 接口集成電路 Qd UART w/16b 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 |
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