參數(shù)資料
型號: XR19L220IL40-F
廠商: Exar Corporation
文件頁數(shù): 9/43頁
文件大?。?/td> 0K
描述: IC UART/TXRX RS232 40QFN
標(biāo)準(zhǔn)包裝: 490
特點: *
通道數(shù): 1,UART
FIFO's: 16 字節(jié)
規(guī)程: RS232
電源電壓: 3 V ~ 5.5 V
帶自動流量控制功能:
帶故障啟動位檢測功能:
帶調(diào)制解調(diào)器控制功能:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 40-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 40-QFN 裸露焊盤(6x6)
包裝: 托盤
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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