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參數(shù)資料
型號(hào): XR88C681J-F
廠商: Exar Corporation
文件頁(yè)數(shù): 48/101頁(yè)
文件大小: 0K
描述: IC UART CMOS DUAL 44PLCC
標(biāo)準(zhǔn)包裝: 27
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(lèi)型: 表面貼裝
封裝/外殼: 44-LCC(J 形引線(xiàn))
供應(yīng)商設(shè)備封裝: 44-PLCC(16.59x16.59)
包裝: 管件
其它名稱(chēng): 1016-1329
XR88C681
50
Rev. 2.11
Figure 23. Schematic of the XR88C681 DUART Device Interfacing to a
“Min” Mode 8086 CPU Device
-RD
-WR
AD0 - AD7
AD8 - AD15
INTR
ALE
HOLD
M/
-IO
-RD
-WR
-DEN
DT/
-R
8086 CPU
C
74LS373
C
D0 - D7
A0 - A3
D8 - D15
A8 - A15
-MEMW
-MEMR
MN/
-MX
Vcc
-INTA
D0 - D7
A4 - A7
Address
Decoder
-CS
-INTR
-IACK
A0 - A3
IEI
from higher
priority device
XR88C681
D
Q
D
Q
D. TIMING CONTROL BLOCK
The Timing Control Block allows to the user to specify the
bit rates that he/she wishes to transmit and receive data at
each channel. The Timing Control Block consists of the
following elements:
D
Oscillator Circuit
D
Bit Rate Generator
D
16 bit Counter/Timer
D
4 - External Input Pins (to clock the Transmitters
and Receivers, directly)
D
Two Clock Select Registers (32:1 MUXs)
Figure 24 presents a block diagram of the Timing Control
block for the XR88C681 device.
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