- 您現(xiàn)在的位置：買賣IC網(wǎng) > PDF目錄16514 > XR17V252IM-0A-EVB (Exar Corporation)EVAL BOARD FOR XR17V252 100TQFP PDF資料下載
參數(shù)資料
| 型號： | XR17V252IM-0A-EVB |
| 廠商： | Exar Corporation |
| 文件頁數(shù)： | 31/69頁 |
| 文件大?。?/td> | 0K |
| 描述： | EVAL BOARD FOR XR17V252 100TQFP |
| 標準包裝： | 1 |
| 系列： | * |
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頁當前第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頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁
XR17V252
37
REV. 1.0.2
66 MHZ PCI BUS DUAL UART WITH POWER MANAGEMENT SUPPORT
4.6.3
Transmitter Operation in FIFO Mode
The host may fill the transmit FIFO with up to 64 bytes of transmit data. The THR empty flag (LSR bit [5]) is set
whenever the FIFO is empty. The THR empty flag can generate a transmit empty interrupt (ISR bit [1]) when
the amount of data in the FIFO falls below its programmed trigger level (see TXTRG register). The transmit
empty interrupt is enabled by IER bit [1]. The TSR flag (LSR bit [6]) is set when TSR becomes completely
empty. Furthermore, with the RS485 half-duplex direction control enabled (FCTR bit [5]=1) the source of the
transmit empty interrupt changes to TSR empty instead of THR empty. This is to ensure the RTS# output is not
changed until the last stop bit of the last character is shifted out.
4.6.4
Auto RS485 Operation
The auto RS485 half-duplex direction control changes the behavior of the transmitter when enabled by FCTR
bit [5]. It de-asserts RTS# or DTR# after a specified delay indicated in MSR[7:4] following the last stop bit of the
last character that has been transmitted. This helps in turning around the transceiver to receive the remote
station’s response. The delay optimizes the time needed for the last transmission to reach the farthest station
on a long cable network before switching off the line driver. This delay prevents undesirable line signal
disturbance that causes signal degradation. It also changes the transmitter empty interrupt to TSR empty
instead of THR empty.
FIGURE 15. TRANSMITTER OPERATION IN NON-FIFO MODE
Transmit
Holding
Register
(THR)
Transmit Shift Register (TSR)
Data
Byte
L
S
B
M
S
B
THR Interrupt (ISR bit-1)
Enabled by IER bit-1
TXNOFIFO1
16X or 8X
Clock
(8XMODE
Register)
相關PDF資料 |
PDF描述 |
|---|---|
| 6278890-4 | C/A 62.5 OFNR MTRJ-MTRJ RED SEC |
| 6374656-4 | C/A LC TO LC MM 2.0MM 4M |
| VE-J5R-EX | CONVERTER MOD DC/DC 7.5V 75W |
| RBC26DRXN | CONN EDGECARD 52POS DIP .100 SLD |
| RBM15DTMN | CONN EDGECARD 30POS R/A .156 SLD |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| XR17V252IM-F | 功能描述:UART 接口集成電路 66MHz Dual PCI UART 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 |
| XR17V252IMTR-F | 制造商:Exar Corporation 功能描述:UART 2-CH 64Byte FIFO 3.3V 100-Pin TQFP T/R 制造商:Exar Corporation 功能描述:XR17V252IMTR-F |
| XR17V254 | 制造商:EXAR 制造商全稱:EXAR 功能描述:66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT |
| XR17V254_08 | 制造商:EXAR 制造商全稱:EXAR 功能描述:66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT |
| XR17V254IV | 制造商:EXAR 制造商全稱:EXAR 功能描述:66MHZ PCI BUS QUAD UART WITH POWER MANAGEMENT SUPPORT |
發(fā)布緊急采購，3分鐘左右您將得到回復。