参数资料
型号: ST16C2552CJ44
厂商: EXAR CORP
元件分类: Serial IO/Communication Controller
英文描述: 2 CHANNEL(S), 4M bps, SERIAL COMM CONTROLLER, PQCC44
封装: PLASTIC, LCC-44
文件页数: 8/38页
文件大小: 447K
代理商: ST16C2552CJ44
ST16C2552
14
2.97V TO 5.5V DUAL UART WITH 16-BYTE FIFO
REV. 4.2.1
2.12
Internal Loopback
The 2552 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. 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 11. INTERNAL LOOP BACK IN CHANNEL A AND B
TXA/TXB
RXA/RXB
M
o
dem
/
Gen
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ral
Purpo
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e
Contro
lL
ogi
c
In
ternal
D
a
ta
Bus
Lines
and
C
o
ntr
o
lSigna
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#)
VCC
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相关代理商/技术参数
参数描述
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