參數(shù)資料
型號(hào)： XR19L220IL40-0A-EB
廠商： Exar Corporation
文件頁(yè)數(shù)： 9/43頁(yè)
文件大?。?/td> 0K
描述： EVAL BOARD FOR XR19L202 40QFN
標(biāo)準(zhǔn)包裝： 1
系列： *
XR19L220
17
REV. 1.0.2
SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
2.18
Internal Loopback
The L220 UART provides an internal loopback capability for system diagnostic purposes. The internal
loopback mode is enabled by setting MCR register bit-4 to logic 1. All regular UART functions operate normally
including automatic hardware and software flow control. Figure 11 below shows how the internal UART signals
are re-configured. Transmit data from the transmit shift register output is internally routed to the receive shift
register input allowing the system to receive the same data that it was sending. The TX, RTS# and DTR# pins
are held HIGH while CTS#, DSR#, CD# and RI# inputs are ignored. Caution: the RX input pin must be held at
inactive during loopback test else upon exiting the loopback test the UART may detect and report a false
“break” signal.
FIGURE 11. INTERNAL LOOP BACK
TX
RX
Mo
dem
/
G
e
n
e
ra
lP
u
rp
ose
C
o
n
trol
L
ogic
In
te
rna
lDa
ta
Bu
s
Li
n
e
s
and
Control
S
ig
n
als
RTS#
MCR bit-4=1
VC C
VCC
Transm it Shift R egister
(TH R/FIFO )
Receive Shift R egister
(RHR /FIFO )
CTS#
DTR #
DSR#
RI#
CD #
OP1#
RTS#
CTS#
DTR#
DSR#
RI#
CD#
VC C
OP2#
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
XR19L220IL40-0B-EB 功能描述:界面開(kāi)發(fā)工具 Supports L220 40 pin QFN, PCI Interface RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類(lèi)型:RS-485 工具用于評(píng)估:ADM3485E 接口類(lèi)型:RS-485 工作電源電壓:3.3 V
XR19L220IL40-F 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
XR19L222 制造商:EXAR 制造商全稱(chēng):EXAR 功能描述:TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
XR19L222IL64 制造商:EXAR 制造商全稱(chēng):EXAR 功能描述:TWO CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
XR19L222IL64-0B-EB 功能描述:界面開(kāi)發(fā)工具 Supports L222 64 pin QFN, pci Interface RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類(lèi)型:RS-485 工具用于評(píng)估:ADM3485E 接口類(lèi)型:RS-485 工作電源電壓:3.3 V
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