- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄383949 > TL16C554AI (Texas Instruments, Inc.) ASYNCHRONOUS-COMMUNICATIONS ELEMENT PDF資料下載
參數(shù)資料
| 型號(hào)： | TL16C554AI |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | ASYNCHRONOUS-COMMUNICATIONS ELEMENT |
| 中文描述： | 異步通信元 |
| 文件頁(yè)數(shù)： | 22/40頁(yè) |
| 文件大?。?/td> | 605K |
| 代理商： | TL16C554AI |
第1頁(yè)第2頁(yè)第3頁(yè)第4頁(yè)第5頁(yè)第6頁(yè)第7頁(yè)第8頁(yè)第9頁(yè)第10頁(yè)第11頁(yè)第12頁(yè)第13頁(yè)第14頁(yè)第15頁(yè)第16頁(yè)第17頁(yè)第18頁(yè)第19頁(yè)第20頁(yè)第21頁(yè)當(dāng)前第22頁(yè)第23頁(yè)第24頁(yè)第25頁(yè)第26頁(yè)第27頁(yè)第28頁(yè)第29頁(yè)第30頁(yè)第31頁(yè)第32頁(yè)第33頁(yè)第34頁(yè)第35頁(yè)第36頁(yè)第37頁(yè)第38頁(yè)第39頁(yè)第40頁(yè)
TL16C554A, TL16C554AI
ASYNCHRONOUS-COMMUNICATIONS ELEMENT
SLLS509A
–
AUGUST 2001
–
REVISED JULY 2003
22
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
PRINCIPLES OF OPERATION
interrupt-enable register (IER)
The IER independently enables the four serial channel interrupt sources that activate the interrupt (INTA, B, C,
D) output. All interrupts are disabled by clearing IER0
–
IER3 of the IER. Interrupts are enabled by setting the
appropriate bits of the IER. Disabling the interrupt system inhibits the IIR and the active (high) interrupt output.
All other system functions operate in their normal manner, including the setting of the LSR and MSR. The
contents of the IER are shown in Table 3 and described in the following bulleted list:
Bit 0:
When IER0 is set, IER0 enables the received data available interrupt and the timeout interrupts in
the FIFO mode.
Bit 1:
When IER1 is set, the transmitter holding register empty interrupt is enabled.
Bit 2:
When IER2 is set, the receiver line status interrupt is enabled.
Bit 3:
When IER3 is set, the modem-status interrupt is enabled.
Bits 4
–
7: IER4
–
IER7. These four bits of the IER are cleared.
interrupt-identification register (IIR)
In order to minimize software overhead during data character transfers, the serial channel prioritizes interrupts
into four levels as follows:
Priority 1
–
Receiver line status (highest priority)
Priority 2
–
Receiver data ready or receiver character timeout
Priority 3
–
Transmitter holding register empty
Priority 4
–
Modem status (lowest priority)
The IIR stores information indicating that a prioritized interrupt is pending and the type of interrupt. The IIR
indicates the highest priority interrupt pending. The contents of the IIR are indicated in Table 5.
Table 5. Interrupt Control Functions
INTERRUPT
IDENTIFICATION
REGISTER
INTERRUPT SET AND RESET FUNCTIONS
BIT 3
BIT 2
BIT 1
BIT 0
PRIORITY
LEVEL
INTERRUPT TYPE
INTERRUPT SOURCE
INTERRUPT
RESET CONTROL
0
0
0
1
—
None
None
—
0
1
1
0
First
Receiver line status
OE, PE, FE, or BI
LSR read
0
1
0
0
Second
Received data available
Receiver data available or
trigger level reached
RBR read until FIFO
drops below the trigger
level
1
1
0
0
Second
Character time-out
indicator
No characters have been
removed from or input to the
receiver FIFO during the last
four character times, and there
is at least one character in it
during this time.
RBR read
0
0
1
0
Third
THRE
THRE
IIR read (if THRE is the
interrupt source), or
THR write
0
0
0
0
Fourth
Modem status
CTS, DSR, RI, or DCD
MSR read
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| TL16C554I | ASYNCHRONOUS COMMUNICATIONS ELEMENT |
| TL2575-15I | 1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS |
| TL2575-33I | 1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS |
| TL2575_0701 | 1-A SIMPLE STEP-DOWN SWITCHING VOLTAGE REGULATORS |
| TL3414AIPE4 | DUAL HIGH OUTPUT CURRENT OPERATIONAL AMPLIFIER |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| TL16C554AIFN | 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 |
| TL16C554AIFNR | 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 |
| TL16C554AIPN | 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 |
| TL16C554AIPNG4 | 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 |
| TL16C554AIPNR | 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 |
發(fā)布緊急采購(gòu)，3分鐘左右您將得到回復(fù)。