TS80C52zzz-MIC Atmel Corporation, TS80C52zzz-MIC Datasheet - Page 35

• Manufacturer Part Number: TS80C52zzz-MIC
• Description: 8-bit Microcontroller 8 Kbytes ROM/OTP, ROMless
• Manufacturer: Atmel Corporation

Figure 12. Programming and Verification Signal’s Waveform
EPROM Erasure
(Windowed Packages
Only)
Erasure Characteristics
Signature Bytes
4184E–8051–09/02
Control signals
ALE/PROG
EA/VPP
A0-A12
D0-D7
12.75V
5V
0V
Erasing the EPROM erases the code array, the encryption array and the lock bits return-
ing the parts to full functionality.
Erasure leaves all the EPROM cells in a 1’s state (FF).
The recommended erasure procedure is exposure to ultraviolet light (at 2537 Å) to an
integrated dose at least 15 W-sec/cm
12,000 µW/cm
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 wave-
length shorter than approximately 4,000 Å. 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.
The TS80/87C52X2 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 pro-
vided in Table 31. for Read Signature Bytes. Table 35. shows the content of the
signature byte for the TS80/87C52X2.
Table 21. Signature Bytes Content
Programming Cycle
Location
Data In
30h
31h
60h
60h
60h
61h
100µs
2
rating for 30 minutes, at a distance of about 25 mm, should be sufficient.
Contents
ADh
2Dh
58h
57h
20h
FFh
Read/Verify Cycle
2
. Exposing the EPROM to an ultraviolet lamp of
Data Out
Comment
Manufacturer Code: Atmel
Family Code: C51 X2
Product name: TS80C52X2
Product name: TS87C52X2
Product name: TS80C32X2
Product revision number
TS8xCx2X2
35