REV. 1.0.3 TWO CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER 2.15 Internal Loopback The L402 UART provides an intern" />
參數(shù)資料
型號(hào)： XR19L402IL48-0B-EB
廠商： Exar Corporation
文件頁(yè)數(shù)： 14/49頁(yè)
文件大小： 0K
描述： EVAL BOARD FOR XR19L402-B 48QFN
標(biāo)準(zhǔn)包裝： 1
系列： *
XR19L402
21
REV. 1.0.3
TWO CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER
2.15
Internal Loopback
The L402 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 12 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.
FIGURE 12. INTERNAL LOOP BACK
TXA/
TXB
RXA/
RXB
Mode
m
/
General
Purp
ose
Co
nt
ro
lLogic
Internal
Data
Bus
Li
nes
and
Co
ntro
lSi
gnals
RTSA#/
RTSB#
MCR bit-4=1
VCC
Transmit Shift Register
(THR/FIFO)
Receive Shift Register
(RHR/FIFO)
CTSA#/
CTSB#
DTRA#/
DTRB#
DSRA#/
DSRB#
RIA#/
RIB#
CDA#/
CDB#
OP1#
RTS
CTS
DTR
DSR
RI
CD
VCC
OP2#
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