參數(shù)資料
型號： XR17D154
廠商： Exar Corporation
英文描述： UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
中文描述： 通用（3.3V和5V）PCI總線四的UART
文件頁數(shù)： 22/69頁
文件大?。?/td> 836K
代理商： XR17D154
xr
XR17D154
REV. 1.2.0
UNIVERSAL (3.3V AND 5V) PCI BUS QUAD UART
29
5.2.3
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.
5.2.4
Auto RS485 Operation
The auto RS485 half-duplex direction control changes the behavior of the transmitter when enabled by FCTR
bit-5. While transmitting, the RTS# or DTR# signal is HIGH. The RTS# or DTR# signal changes from HIGH to
LOW 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 12. TRANSMITTER OPERATION IN NON-FIFO MODE
FIGURE 13. TRANSMIITTER OPERATION IN FIFO AND FLOW CONTROL MODE
T rans m it
H o ld in g
R egis te r
(T HR)
T rans m it Shift R egis ter (T S R )
Da ta
By te
L
S
B
M
S
B
T H R In te r ru p t (IS R b it-1 )
E nabled by IE R bit-1
TXN O FIFO 1
16X or 8X
Clo c k
(8 X M O D E
R egis te r )
T ra n sm it D a ta S h ift R e g is te r
(T S R )
T ransm it
D ata B yte
T H R In te rru p t (IS R b it-1 ) fa lls
below P rogra m m ed T rigger
Level (T X T R G ) and then
w hen becom es em pty. F IF O
is E nabled by F C R bit-0=1
T ransm it
FIF O
(64 -B yte )
TX FIFO 1
16X or 8X C lock
(8X M O D E R egister)
A u to C T S F low C ontro l (C T S # pin)
A u to S o ftw are F low C o n trol
F low C ontro l C harac ters
(X off1 /2 and X on1/2 R eg.
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參數(shù)描述
XR17D154CV 功能描述:UART 接口集成電路 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
XR17D154CV-0A-EVB 功能描述:界面開發(fā)工具 Supports D154 144 ld TQFP, PCI Interface RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
XR17D154CV-F 功能描述:UART 接口集成電路 3.3V-5V 64B FIFO temp 0C to 70C; 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
XR17D154CVTR-F 制造商:Exar Corporation 功能描述:UART 4-CH 64Byte FIFO 3.3V/5V 144-Pin LQFP T/R 制造商:Exar Corporation 功能描述:XR17D154CVTR-F
XR17D154IV 功能描述:UART 接口集成電路 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
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