- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄376454 > XR16C872 (Exar Corporation) Dual UART with 1284 Parallel Port and Plug-and-Play（PnP） Controller(雙通用異步接收器/發(fā)送器（帶1284雙向并行端口和即插即用控制器）) PDF資料下載
參數(shù)資料
| 型號： | XR16C872 |
| 廠商： | Exar Corporation |
| 英文描述： | Dual UART with 1284 Parallel Port and Plug-and-Play（PnP） Controller(雙通用異步接收器/發(fā)送器（帶1284雙向并行端口和即插即用控制器）) |
| 中文描述： | 雙UART）與1284并行端口，插頭插即用（PnP）功能控制器（雙通用異步接收器/發(fā)送器（帶1284雙向并行端口和即插即用控制器） |
| 文件頁數(shù)： | 18/60頁 |
| 文件大小： | 314K |
| 代理商： | XR16C872 |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁當前第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁
XR16C872
18
Rev. P1.00
Preliminary
FIFO Operation
128 byte transmit and receive data FIFOs are enabled
by the FIFO Control Register (FCR) bit-0. The standard
16C550 provides only receive FIFO of 16 bytes with 4
selectable trigger levels and there is no transmit trigger
level selection. The 872 UART provides independent
programmable trigger levels from 0 to 128 for both
receiver and transmitter. When receive or transmit
data has reached the preset trigger level the UART
generates an interrupt to call for service. The receive
FIFO section includes a time-out function to ensure
data is delivered to the CPU. A receive data time-out
interrupt is generated when there is no receive data for
a period of about 4-characters but the Receive Holding
Register (RHR) is full or data did not reach the receive
trigger level. See in the timing diagram area for TX and
RX FIFO operation.
Hardware (RTS/CTS) Flow Control Operation
Automatic hardware or RTS and CTS flow control is
used to prevent data overrun to the local receiver FIFO
and remote receiver FIFO. The RTS# output pin is used
to request remote unit to suspend/restart data trans-
mission while the CTS# input pin is monitored to
suspend/restart local transmitter. The auto RTS and
auto CTS flow control features are individually se-
lected to fit specific application requirements and
enabled through EFR bit-6 and 7. The auto RTS
function must be started by asserting RTS# pin (MCR
bit-1=1) after it is enabled.
RTSA#
CTSB#
RXA
TXB
Transmitter
Receiver FIFO Trigger
Reached
Auto RTS Trigger
Level
Auto CTS
Monitor
RTSA#
TXB
RXA FIFO
CTSB#
Remote UART
UARTB
Local UART
UARTA
ON
OFF
ON
Suspend
Restart
RTS High
Threshold
B
B
B
B
Starts
B
C
C
C
C
B
B
B
B
B
B
B
C
C
C
C
C
C
ON
OFF
ON
Assert RTS# to Begin Transmission
C
C
B
C
C
1
2
3
4
5
6
7
Receive Data
RTS Low
Threshold
9
10
11
C
Receiver FIFO
Trigger Reached
Auto RTS Trigger
Level
Transmitter
Auto CTS
Monitor
RTSB#
CTSA#
RXB
TXA
INTA
(RXA FIFO
Interrupt)
RX FIFO Trigger
Level
RX FIFO Trigger
Level
8
12
Figure 4.
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| XR16L2450 | 2.25V TO 5.5V DUART |
| XR16L2450IJ | 97-3108A20-29S-KIT |
| XR16L2450IM | 2.25V TO 5.5V DUART |
| XR16L2550IJ | LOW VOLTAGE DUART WITH 16-BYTE FIFO |
| XR16L2550IL | LOW VOLTAGE DUART WITH 16-BYTE FIFO |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| XR16C872CQ | 制造商:EXAR 制造商全稱:EXAR 功能描述:DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER |
| XR16C872IQ | 制造商:EXAR 制造商全稱:EXAR 功能描述:DUAL UART WITH 1284 PARALLEL PORT AND PLUG-AND-PLAY CONTROLLER |
| XR16L2450 | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.25V TO 5.5V DUART |
| XR16L2450_05 | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.25V TO 5.5V DUART |
| XR16L2450IJ | 制造商:EXAR 制造商全稱:EXAR 功能描述:2.25V TO 5.5V DUART |
發(fā)布緊急采購，3分鐘左右您將得到回復(fù)。