參數(shù)資料
型號: ST16C2552CJ44
廠商: EXAR CORP
元件分類: Serial IO/Communication Controller
英文描述: 2 CHANNEL(S), 4M bps, SERIAL COMM CONTROLLER, PQCC44
封裝: PLASTIC, LCC-44
文件頁數(shù): 8/38頁
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
e
ral
Purpo
s
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
相關(guān)PDF資料
PDF描述
ST16C552CJ68 2 CHANNEL(S), SERIAL COMM CONTROLLER, PQCC68
ST16C554DCJ68 4 CHANNEL(S), 1.5M bps, SERIAL COMM CONTROLLER, PQCC68
ST1803DHI High Voltage Fast-Switching NPN Power Transistor(高電壓快速開關(guān)NPN功率晶體管)
ST180S16P1PBF 314 A, 1600 V, SCR, TO-209AB
ST1W008S4A 8 CONTACT(S), MALE, PCMCIA CONNECTOR, SOLDER
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
ST16C2552CJ44-F 功能描述:UART 接口集成電路 2.97V-5.5V 16B FIFO temp 0C to 70C; 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
ST16C2552CJ44TR 制造商:Rochester Electronics LLC 功能描述: 制造商:Exar Corporation 功能描述:
ST16C2552CJ44TR-F 功能描述:UART 接口集成電路 DUAL UART W/16BYTE FIFO 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
ST16C2552CQ48 制造商:未知廠家 制造商全稱:未知廠家 功能描述:UART
ST16C2552IJ 制造商:Exar Corporation 功能描述:2 CHANNEL(S), 4M bps, SERIAL COMM CONTROLLER, PQCC44