REV. 1.1.1 HIGH PERFORMANCE DUART WITH 64-BYTE FIFO 2.20 Internal Loopback The M752 UART provides an interna" />
參數(shù)資料
型號: XR16M752IL32-F
廠商: Exar Corporation
文件頁數(shù): 16/54頁
文件大?。?/td> 0K
描述: IC UART FIFO 64B DUAL 32QFN
標(biāo)準(zhǔn)包裝: 490
特點: *
通道數(shù): 2,DUART
FIFO's: 64 字節(jié)
規(guī)程: RS232,RS422,RS485
電源電壓: 1.62 V ~ 3.63 V
帶自動流量控制功能:
帶IrDA 編碼器/解碼器:
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: 32-VFQFN 裸露焊盤
供應(yīng)商設(shè)備封裝: 32-QFN 裸露焊盤(5x5)
包裝: 托盤
XR16M752/XR68M752
23
REV. 1.1.1
HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
2.20
Internal Loopback
The M752 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, RTS# and DTR# pins are held while the CTS#, DSR# CD# and RI# inputs are ignored.
Caution: the RX input pin must be held HIGH during loopback test else upon exiting the loopback test the
UART may detect and report a false “break” signal. Also, Auto RTS/CTS flow control is not supported during
internal loopback.
FIGURE 13. INTERNAL LOOP BACK IN CHANNEL A AND B
TXA/TXB
RXA/RXB
Modem
/
G
en
eral
Purpos
e
Cont
rol
Logic
Inte
rn
a
lD
a
ta
Bus
L
ines
and
Co
ntrol
Signa
ls
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#
OP2#
RTS#
CTS#
DTR#
DSR#
RI#
CD#
VCC
OP2A#/OP2B#
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