参数资料
型号: XR16C850CJ-F
厂商: Exar Corporation
文件页数: 17/56页
文件大小: 0K
描述: IC UART FIFO 128B 44PLCC
标准包装: 27
特点: *
通道数: 1,UART
FIFO's: 128 字节
规程: RS485
电源电压: 2.97 V ~ 5.5 V
带自动流量控制功能:
带IrDA 编码器/解码器:
带故障启动位检测功能:
带调制解调器控制功能:
带CMOS:
安装类型: 表面贴装
封装/外壳: 44-LCC(J 形引线)
供应商设备封装: 44-PLCC(16.59x16.59)
包装: 管件
XR16C850
xr
2.97V TO 5.5V UART WITH 128-BYTE FIFO
REV. 2.3.1
24
2.22
Internal Loopback
The 850 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 16 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 16. INTERNAL LOOPBACK
TX
RX
M
odem
/
G
ene
ra
lP
u
rpos
e
C
ontr
o
lLogic
In
ter
n
al
Data
Bus
Lines
an
d
C
o
ntrol
Signals
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
OP2#
VCC
OP1#
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