參數(shù)資料
型號: ST16C1551CJ28
廠商: EXAR CORP
元件分類: Serial IO/Communication Controller
英文描述: 1 CHANNEL(S), 1.5M bps, SERIAL COMM CONTROLLER, PQCC28
封裝: PLASTIC, LCC-28
文件頁數(shù): 5/38頁
文件大?。?/td> 622K
代理商: ST16C1551CJ28
xr
ST16C1550/51
REV. 4.2.1
2.97V TO 5.5V UART WITH 16-BYTE FIFO
13
2.8
Internal Loopback
The 155X 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 7 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 at logic 1 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 to a logic 1 during loopback
test else upon exiting the loopback test the UART may detect and report a false “break” signal.
FIGURE 7. INTERNAL LOOPBACK
TX
RX
Mo
dem
/
G
e
ne
ra
lP
u
rp
os
e
C
o
nt
ro
lLogic
Internal
Data
B
u
s
Lines
and
Control
S
ignals
RTS#
MCR bit-4=1
VCC
Transmit Shift Register
(THR/FIFO)
Receive Shift Register
(RHR/FIFO)
CTS#
DTR#
DSR#
RI#
CD#
OP1#
OP2#
RTS#
CTS#
DTR#
DSR#
RI#
CD#
VCC
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