參數(shù)資料
型號(hào)： XR88C681P/40
廠商： Exar Corporation
文件頁(yè)數(shù)： 85/101頁(yè)
文件大?。?/td> 0K
描述： IC UART CMOS DUAL 40PDIP
產(chǎn)品變化通告： Leaded UART, V&I Obsolescence 11/Apr/2011
標(biāo)準(zhǔn)包裝： 9
特點(diǎn)： *
通道數(shù)： 2，DUART
FIFO's： 1 字節(jié)，3 字節(jié)
電源電壓： 4.75 V ~ 5.25 V
帶并行端口： 是
帶CMOS： 是
安裝類型： 通孔
封裝/外殼： 40-DIP（0.600"，15.24mm）
供應(yīng)商設(shè)備封裝： 40-PDIP
包裝： 管件
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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