參數(shù)資料
型號(hào): XR16M780IB25-F
廠商: Exar Corporation
文件頁(yè)數(shù): 17/58頁(yè)
文件大?。?/td> 0K
描述: IC UART FIFO 64B 25BGA
標(biāo)準(zhǔn)包裝: 714
特點(diǎn): *
通道數(shù): 1,UART
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(dòng)流量控制功能:
帶IrDA 編碼器/解碼器:
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: 25-WFBGA
供應(yīng)商設(shè)備封裝: 25-BGA(3x3)
包裝: 托盤
XR16M780
24
1.62V TO 3.63V HIGH PERFORMANCE UART WITH 64-BYTE FIFO
REV. 1.0.0
2.18
Internal Loopback
The M780 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 15 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 HIGH or mark condition while RTS# and DTR# are de-asserted,
and CTS#, DSR# CD# and RI# inputs are ignored. Caution: the RX input must be held HIGH during loopback
test else upon exiting the loopback test the UART may detect and report a false “break” signal.
FIGURE 15. INTERNAL LOOPBACK
TX
RX
M
ode
m
/
G
ene
ra
l
P
u
rpose
Control
L
ogi
c
Inte
rnal
D
a
ta
Bus
Line
s
and
Control
S
ignals
RT S #
M C R bit-4=1
VC C
T ra n s m it S h ift R e g is te r
(T H R /FIFO )
R e c e iv e S h ift R e gis ter
(RHR/F IF O )
CT S #
DT R#
DS R#
RI#
CD#
OP 1 #
RT S #
CT S #
DT R#
DS R#
RI#
CD #
VC C
OP 2 #
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