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： XR68M752IB-0B-EVB
廠商： Exar Corporation
文件頁數(shù)： 16/54頁
文件大小： 0K
描述： EVAL BOARD FOR 68M752 49BGA
標(biāo)準(zhǔn)包裝： 1
系列： *
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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參數(shù)描述
XR68M752IB49 制造商:EXAR 制造商全稱:EXAR 功能描述:HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
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XR68M752IL-0B-EB 功能描述:界面開發(fā)工具 Support XR68M752 32L QFN, PCI Interface RoHS:否 制造商:Bourns 產(chǎn)品:Evaluation Boards 類型:RS-485 工具用于評估:ADM3485E 接口類型:RS-485 工作電源電壓:3.3 V
XR68M752IL32 制造商:EXAR 制造商全稱:EXAR 功能描述:HIGH PERFORMANCE DUART WITH 64-BYTE FIFO
XR68M752IL32-F 功能描述:UART 接口集成電路 UART RoHS:否 制造商:Texas Instruments 通道數(shù)量:2 數(shù)據(jù)速率:3 Mbps 電源電壓-最大:3.6 V 電源電壓-最小:2.7 V 電源電流:20 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 封裝 / 箱體:LQFP-48 封裝:Reel
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