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參數(shù)資料
| 型號(hào)： | TSC87C52-25MK/883 |
| 廠商： | ATMEL CORP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, UVPROM, 25 MHz, MICROCONTROLLER, CQCC44 |
| 封裝： | WINDOWED, CERAMIC, QPJ-44 |
| 文件頁數(shù)： | 5/23頁 |
| 文件大小： | 182K |
| 代理商： | TSC87C52-25MK/883 |
TSC87C52
13
Rev. E – July 03, 2000
Control
signals
Data In
ALE/PROG
A0–A12
Programming Cycle
1
2
3
5
4
10us
100us
D0–D7
EA/VPP
Data Out
Read/Verify Cycle
12.75V
5V
0V
Figure 9 Programming and verification signal’s waveform
Signature bytes
The TSC87C52 has four signature bytes in location 30h, 31h, 60h and 61h. To read these bytes follow the procedure
for EPROM verify but activate the control lines provided in Table 6 for Read Signature Bytes. Table 7 shows the
content of the signature byte for the TSC87C52.
Table 7 Signature bytes content
Location
Contents
Comment
30h
58h
Customer selection byte: TEMIC
31h
58h
Family selection byte: C51
60h
ADh
TSC87C52
61h
XXh
Product revision number
EPROM Erasure (Windowed Packages Only)
Erasing the EPROM erases the code array and also the encryption array returning the parts to full functionality.
Erasure leaves all the EPROM cells in a 1’s state.
Erasure Characteristics
The recommended erasure procedure is exposure to ultraviolet light (at 2537 ) to an integrated dose at least 15
W–sec/cm2. Exposing the EPROM to an ultraviolet lamp of 12,000
W/cm2 rating for 30 minutes, at a distance of
about 25 mm, should be sufficient.
Erasure of the EPROM begins to occur when the chip is exposed to light with wavelength shorter than approximately
4,000 . Since sunlight and fluorescent lighting have wavelengths in this range, exposure to these light sources over
an extended time (about 1 week in sunlight, or 3 years in room–level fluorescent lighting) could cause inadvertent
erasure. If an application subjects the device to this type of exposure, it is suggested that an opaque label be placed
over the window.
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