REV. 1.0.3 SINGLE CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER 2.13 Internal Loopback The L400 UART provides an int" />
參數(shù)資料
型號(hào): XR19L400IL40TR-F
廠商: Exar Corporation
文件頁(yè)數(shù): 11/46頁(yè)
文件大?。?/td> 0K
描述: IC UART/TXRX RS485 40QFN
標(biāo)準(zhǔn)包裝: 3,000
特點(diǎn): *
通道數(shù): 1,UART
FIFO's: 64 字節(jié)
規(guī)程: RS485
電源電壓: 3.3V,5V
帶自動(dòng)流量控制功能:
帶故障啟動(dòng)位檢測(cè)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: 帶卷 (TR)
XR19L400
19
REV. 1.0.3
SINGLE CHANNEL INTEGRATED UART AND RS-485 TRANSCEIVER
2.13
Internal Loopback
The L400 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 11 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 11. INTERNAL LOOP BACK
TX
RX
Mode
m
/
General
Purp
ose
Co
nt
ro
lLogic
Internal
Data
Bus
Li
nes
and
Co
ntro
lSi
gnals
RTS#
MCR bit-4=1
VCC
Transmit Shift Register
(THR/FIFO)
Receive Shift Register
(RHR/FIFO)
CTS#
DTR#
DSR#
RI#
CD#
OP1#
RTS
CTS
DTR
DSR
RI
CD
VCC
OP2#
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