參數(shù)資料
型號: XR19L200IL32-0B-EB
廠商: Exar Corporation
文件頁數(shù): 6/40頁
文件大小: 0K
描述: EVAL BOARD FOR XR19L200 32QFN
標(biāo)準(zhǔn)包裝: 1
系列: *
XR19L200
14
SINGLE CHANNEL INTEGRATED UART AND RS-232 TRANSCEIVER
REV. 1.0.2
2.15
Internal Loopback
The L200 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 9 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 and RTS# pins are held
HIGH while RX and CTS# 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 9. INTERNAL LOOP BACK
TX
RX
Mo
de
m
/
Ge
ne
ra
l
Pu
rp
ose
Contro
l
L
o
gi
c
In
te
rn
al
Dat
a
B
u
s
L
in
e
s
an
d
Con
tr
o
l
S
ig
n
al
s
MCR bit-4=1
VCC
Transmit Shift Register
(THR/FIFO)
Receive Shift Register
(RHR/FIFO)
OP1#
RTS#
CTS#
DTR#
DSR#
RI#
CD#
OP2#
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