參數(shù)資料
型號: XR88C681JTR-F
廠商: Exar Corporation
文件頁數(shù): 73/101頁
文件大?。?/td> 0K
描述: IC UART CMOS DUAL 44PLCC
標(biāo)準(zhǔn)包裝: 500
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:
帶CMOS:
安裝類型: 表面貼裝
封裝/外殼: 44-LCC(J 形引線)
供應(yīng)商設(shè)備封裝: 44-PLCC(16.59x16.59)
包裝: 帶卷 (TR)
XR88C681
73
Rev. 2.11
MR2n[7:6] - Channel Mode Select
Each Channel can operate in one of four modes.
D
Setting MR2n[7:6] = 00 configures the channel to op-
erate in the Normal Mode. In this mode, the receiver
and transmitter operate independently.
Figure 38
presents a diagram depicting Normal Mode Opera-
tion.
D
Setting MR2n[7:6] = 01 places the channel in the Auto-
matic Echo Mode, which automatically re-transmits
the received data.
Figure 39 presents a diagram de-
picting Automatic Echo Mode Operation. The follow-
ing conditions apply while in this mode.
RXDn
Incoming
Serial Data
Receive Holding
Register
RXCn
Receive Shift Register
To Data Bus
(To be read by the CPU)
Transmit Shift Register
Transmit Holding
Register
TXCn
TXDn
Outgoing Serial
Data
8
From Data Bus.
(Parallel data from the CPU)
Figure 38. A Block Diagram Depicting Normal Mode Operation.
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