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參數(shù)資料
| 型號： | AT80C51RA2-SLSUL |
| 廠商： | International Rectifier |
| 英文描述： | High Performance 8-bit Microcontroller |
| 中文描述： | 高性能8位微控制器 |
| 文件頁數(shù)： | 56/85頁 |
| 文件大?。?/td> | 762K |
| 代理商： | AT80C51RA2-SLSUL |
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56
4188E–8051–08/06
AT/TS8xC51Rx2
The encryption array cannot be directly verified. Verification of the encryption array is done by
observing that the code array is well encrypted.
Figure 9-2.
Programming and Verification Signal’s Waveform
9.4
EPROM Erasure (Windowed Packages Only)
Erasing the EPROM erases the code array, the encryption array and the lock bits returning the
parts to full functionality.
Erasure leaves all the EPROM cells in a 1’s state (FF).
9.4.1
Erasure Characteristics
The recommended erasure procedure is exposure to ultraviolet light (at 2537 ) to an integrated
dose at least 15 W-sec/cm
2
. Exposing the EPROM to an ultraviolet lamp of 12,000
μ
W/cm
2
rat-
ing for 30 minutes, at a distance of about 25 mm, should be sufficient. An exposure of 1 hour is
recommended with most of standard erasers.
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 sub-
jects the device to this type of exposure, it is suggested that an opaque label be placed over the
window.
10. Signature Bytes
The
TS83/87C51RB2/RC2/RD2
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 31. for Read Signature Bytes. Table 10-1. shows the content of the signature byte for the
TS87C51RB2/RC2/RD2.
Table 10-1.
Signature Bytes Content
Control signals
Data In
ALE/PROG
A0-A12
Programming Cycle
100
μ
s
D0-D7
EA/VPP
Data Out
Read/Verify Cycle
12.75V
5V
0V
Location
Contents
Comment
30h
58h
Manufacturer Code: Atmel
31h
57h
Family Code: C51 X2
60h
7Ch
Product name: TS83C51RD2
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| AT80C51RA2-SLSUM | High Performance 8-bit Microcontroller |
| AT80C51RD2-3CSUL | High Performance 8-bit Microcontroller |
| AT80C51RD2-3CSUM | High Performance 8-bit Microcontroller |
| AT80C51RD2-RLTUL | High Performance 8-bit Microcontroller |
| AT80C51RD2-RLTUM | High Performance 8-bit Microcontroller |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| AT80C51RA2-SLSUM | 功能描述:8位微控制器 -MCU RLESS RA 40MHZ 5V RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時鐘頻率:50 MHz 程序存儲器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| AT80C51RB2-3CSCM | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-3CSIM | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-3CSUM | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
| AT80C51RB2-RLTIL | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:80C51 High Performance ROM 8-bit Microcontroller |
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