參數(shù)資料
型號: XR16L784
廠商: Exar Corporation
英文描述: HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
中文描述: 高性能2.97V至5.5V UART的四
文件頁數(shù): 18/52頁
文件大?。?/td> 625K
代理商: XR16L784
XR16L784
HIGH PERFORMANCE 2.97V TO 5.5V QUAD UART
á
REV. 1.2.0
18
2.16
Each UART channel 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 12
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, RTS# and DTR# pins are held HIGH (idle or de-asserted state), and the CTS#, DSR#
CD# and RI# inputs are ignored.
Internal Loopback
F
IGURE
12. I
NTERNAL
L
OOP
B
ACK
TX [3:0]
RX [3:0]
M
I
RTS# [3:0]
MCR bit-4=1
VCC
VCC
Transmit Shift Register
(THR/FIFO)
Receive Shift Register
(RHR/FIFO)
CTS# [3:0]
DTR# [3:0]
DSR# [3:0]
RI# [3:0]
CD# [3:0]
OP1#
OP2#
RTS#
CTS#
DTR#
DSR#
RI#
CD#
VCC
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