參數(shù)資料
型號: XR16L580IM
廠商: EXAR CORP
元件分類: 微控制器/微處理器
英文描述: SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
中文描述: 1 CHANNEL(S), 3.125M bps, SERIAL COMM CONTROLLER, PQFP48
封裝: 7 X 7 MM, 1 MM HEIGHT, TQFP-48
文件頁數(shù): 19/47頁
文件大小: 285K
代理商: XR16L580IM
á
REV. 1.2.0
XR16L580
SMALLEST 2.25V TO 5.5V UART WITH 16-BYTE FIFO AND POWERSAVE
19
2.19
The L580 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
including automatic hardware and software flow control.
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 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 pins 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.
Internal Loopback
F
IGURE
13. I
NTERNAL
L
OOP
B
ACK
TX
RX
M
I
RTS#
MCR bit-4=1
VCC
VCC
Transmit Shift Register
(THR/FIFO)
Receive Shift Register
(RHR/FIFO)
CTS#
DTR#
DSR#
RI#
CD#
OP1#
RTS#
CTS#
DTR#
DSR#
RI#
CD#
VCC
OP2#
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XR16L651 制造商:EXAR 制造商全稱:EXAR 功能描述:2.25V TO 5.5V UART WITH 32-BYTE FIFO