Figure 20 <" />
參數(shù)資料
型號: XR88C681CJ-F
廠商: Exar Corporation
文件頁數(shù): 43/101頁
文件大?。?/td> 0K
描述: IC UART CMOS DUAL 44PLCC
標(biāo)準(zhǔn)包裝: 27
特點: *
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: 管件
其它名稱: 1016-1327-5
XR88C681
46
Rev. 2.11
C.6.2.2 8086 Microprocessor
The 8086 microprocessor is a 16 bit microprocessor manufactured by Intel Corporation.
Figure 20 presents the pin out
diagram of this IC.
Please note that in Figure 20, pins 24 - 31 have some additional labels, located off to the right of the
package. These additional labels will be explained later in this text.
-RQ/-GT0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
GND
AD14
AD13
AD12
AD11
AD10
AD9
AD8
AD7
AD6
AD5
AD4
AD3
AD2
AD1
AD0
NMI
INTR
CLK
GND
RESET
READY
-TEST
QS1
QS0
-S0
-S1
-S2
-LOCK
-RQ/-GT1
-RD
MN/MX
-BHE/S7
A19/S6
A18/S5
A17/S4
A16/S3
AD15
VCC
8086 CPU
Figure 20. Pin Out of the 8086 Microprocessor Device
(DT/-R)
(-DEN)
(ALE)
(-INTA)
(HOLD)
(HLDA)
(-WR)
(M/-IO)
Intel went to great lengths to keep the pin count of this IC
low by multiplexing the functions of many of these pins.
This device consists of a 16 bit Data Bus and a 20 bit
Address Bus. The Data Bus is multiplexed with the lower
16 Address Bits (A0 - A15) to form AD0 - AD15. Address
Bits A16 - A19 are multiplexed with status bits S3 - S6 to
form A16/S3, A17/S4, A18/S5 and A19/S6. All of these
pins are address lines during the first half of a memory
cycle. However, during the second half of a memory
cycle, these pins then take on their alternate functions
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