參數(shù)資料
型號(hào): XR16L2550
廠商: Exar Corporation
英文描述: LOW VOLTAGE DUART WITH 16-BYTE FIFO
中文描述: 低壓杜阿爾特16字節(jié)FIFO
文件頁(yè)數(shù): 19/45頁(yè)
文件大?。?/td> 278K
代理商: XR16L2550
á
REV. 1.0.0
XR16L2550
LOW VOLTAGE DUART WITH 16-BYTE FIFO
19
2.18
The L2550 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.
Figure 13
shows how the modem port 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 pin is held at logic 1 or mark condition while RTS# and DTR# are de-asserted, and
CTS#, DSR# CD# and RI# inputs are ignored. Caution: the RX input pins must be held to a logic 1 during
loopback test else upon exiting the loopback test the UART may detect and report a false “break” signal. Also,
Auto RTS/CTS is not supported during internal loopback.
Internal Loopback
F
IGURE
13. I
NTERNAL
L
OOP
B
ACK
IN
C
HANNEL
A
AND
B
TXA/TXB
RXA/RXB
M
I
RTSA#/RTSB#
MCR bit-4=1
VCC
VCC
Transmit Shift Register
(THR/FIFO)
Receive Shift Register
(RHR/FIFO)
CTSA#/CTSB#
DTRA#/DTRB#
DSRA#/DSRB#
RIA#/RIB#
CDA#/CDB#
OP1#
OP2#
RTS#
CTS#
DTR#
DSR#
RI#
CD#
VCC
VCC
OP2A#/OP2B#
相關(guān)PDF資料
PDF描述
XR16L2551 LOW VOLTAGE DUART WITH POWERSAVE
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