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參數(shù)資料
| 型號： | 8742 |
| 廠商： | Intel Corp. |
| 英文描述： | 8742 Universal Peripheral Interface 8-Bit Slave Microcontroller(8742 通用外設接口8位從模式微控制器) |
| 中文描述： | 8742通用外圍設備接口的8位微控制器奴隸（8742通用外設接口8位從模式微控制器） |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 210K |
| 代理商： | 8742 |
8742
PROGRAMMING, VERIFYING, AND
ERASING THE 8742 EPROM
Programming Verification
In brief, the programming process consists of: acti-
vating the program mode, applying an address,
latching the address, applying data, and applying a
programming pulse. Each word is programmed com-
pletely before moving on to the next and is followed
by a verification step. The following is a list of the
pins used for programming and a description of their
functions:
Pin
Function
XTAL 1
Reset
Test 0
EA
BUS
Clock-Input
Initialization and Address Latching
Selection of Program or Verify Mode
Activation of Program/Verify Modes
Address and Data Input
Data Output During Verify
Address Input
Programming Power Supply
Program Pulse Input
P
20–12
V
DD
PROG
WARNING
An attempt to program a missocketed 8742 will result in severe dam-
age to the part. An indication of a properly socketed part is the ap-
pearance of the SYNC clock output. The lack of this clock may be
used to disable the programmer.
The Program/Verify sequence is:
1. A
0
e
0V, CS
e
5V, EA
e
5V, RESET
e
0V,
TESTO
e
5V, V
DD
e
5V, clock applied or inter-
nal oscillator operating, BUS floating, PROG
e
5V.
2. Insert 8742 in programming socket
3. TEST 0
e
0V (select program mode)
4. EA
e
18V (active program mode)
5. Address applied to BUS and P
20–22
6. RESET
e
5V (latch address)
7. Data applied to BUS
**
8. V
DD
e
21V (programming power)
9. PROG
e
V
CC
followed by one 50 ms pulse to
18V
10. V
DD
e
5V
11.TEST 0
e
5V (verify mode)
12. Read and verify data on BUS
13. TEST 0
e
0V
14. RESET
e
0V and repeat from step 5
15. Programmer should be at conditions of step 1
when 8742 is removed from socket
8742 Erasure Characteristics
The erasure characteristics of the 8742 are such
that erasure begins to occur when exposed to light
with wavelengths shorter than approximately 4000
Angstroms (
D
). It should be noted that sunlight and
certain types of fluorescent lamps have wavelengths
in the 3000-4000
D
range. Data shows that constant
exposure to room level fluorescent lighting could
erase the typical 8742 in approximately 3 years
while it would take approximately one week to cause
erasure when exposed to direct sunlight. If the 8742
is to be exposed to these types of lighting conditions
for extended periods of time, opaque labels are
available from Intel which should be placed over the
8742 window to prevent unintentional erasure.
The recommended erasure procedure for the 8742
is exposure to shortwave ultraviolet light which has a
wavelength of 2537
D
. The integrated dose (i.e., UV
intensity
c
exposure time) for erasure should be a
minimum of 15 w-sec/cm
2
. The erasure time with
this dosage is approximately 15 to 20 minutes using
an ultraviolet lamp with a 12,000
m
W/cm
2
power rat-
ing. The 8742 should be placed within one inch of
the lamp tubes during erasure. Some lamps have a
filter on their tubes which should be removed before
erasure.
6
6
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 8742 0601000 | 制造商:Belden Inc 功能描述:PAIRED CABLE, 3 PR, 22AWG SOLID, PVC INSULATED, INSTRUMENTATION/CONTROL CHROME 制造商:Belden Inc 功能描述:UNSHLD MULTIPR CABLE 3PR 1000FT 300V CHR, Reel Length (Imperial):1000ft, Reel Le 制造商:Belden Inc 功能描述:UNSHLD MULTIPR CABLE 3PR 1000FT 300V CHR, Reel Length (Imperial):1000ft, Reel Length (Metric):304.8m, LAN Category:-, No. of Pairs:3, Conductor Size AWG:22AWG, Jacket Color:Chrome, Jacket Material:PVC (Polyvinyl Chloride) , RoHS Compliant: Yes |
| 8742 060500 | 制造商:Belden Inc 功能描述:UNSHLD MULTIPR CABLE 3PR 500FT 300V CHR, Reel Length (Imperial):500ft, Reel Leng |
| 8742 0605000 | 功能描述:CBL 3COND 22AWG 制造商:belden inc. 系列:* 零件狀態(tài):在售 標準包裝:5,000 |
| 874208BKILF | 功能描述:時鐘驅(qū)動器及分配 RoHS:否 制造商:Micrel 乘法/除法因子:1:4 輸出類型:Differential 最大輸出頻率:4.2 GHz 電源電壓-最大: 電源電壓-最小:5 V 最大工作溫度:+ 85 C 封裝 / 箱體:SOIC-8 封裝:Reel |
| 874208BKILFT | 功能描述:時鐘驅(qū)動器及分配 RoHS:否 制造商:Micrel 乘法/除法因子:1:4 輸出類型:Differential 最大輸出頻率:4.2 GHz 電源電壓-最大: 電源電壓-最小:5 V 最大工作溫度:+ 85 C 封裝 / 箱體:SOIC-8 封裝:Reel |
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