参数资料
型号: XR88C681J-F
厂商: Exar Corporation
文件页数: 85/101页
文件大小: 0K
描述: IC UART CMOS DUAL 44PLCC
标准包装: 27
特点: *
通道数: 2,DUART
FIFO's: 1 字节,3 字节
电源电压: 4.75 V ~ 5.25 V
带并行端口:
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
其它名称: 1016-1329
XR88C681
84
Rev. 2.11
Is
TXEMT
Asserted
?
START
ASSERT RTSA
(Write 01h to DUART Address 0Eh)
*RTSA is Automatically Negated by
Receiver Controlled RTS Function.
(OP0 toggles “High”)
Is
TXRDY
Negated?
Generate “Input Port Change of State”
Interrupt (IP2) in Receiving Device
Is
IP2 = 1
?
TOGGLE OP3 (CTS_out) PIN
“LOW”
(Write 08h to DUART Address 0Eh)
TOGGLE OP3 (CTS_out) PIN
“HIGH”
(Write 08h to DUART Address 0Fh)
*CTSA INPUT IS ASSERTED.
Data transmission is now permitted.
-CTSA INPUT IS NEGATED.
Data transmission is disabled.
No
Yes
No
Yes
No
Figure 45. A Flow Diagram depicting an Algorithm that could be used to Realize the
Transmitter-Controlled RTS/CTS Handshaking Mode
H.2 Multi-drop (8051 9 bit) Mode
Each serial channel of the DUART can be configured to
operate in a wake up mode useful for multi-drop or
multiprocessor applications. This section will first present
the concept of the Multi-Drop Mode. Afterwards, the
function and procedure of operating the DUART in the
Multi-Drop mode is discussed in
Section H.2.1.
H.2.1 Concept of Multi-Drop Mode
This mode is compatible with the serial “Nine bit Mode” of
8051 family microcomputers. In this mode of operation a
“master station”, connected to a maximum of 256 slave
station is possible, as depicted in
Figure 46.
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