TS87C51RB2-LIA Atmel, TS87C51RB2-LIA Datasheet - Page 56

• Manufacturer Part Number: TS87C51RB2-LIA
• Description: IC MCU 8BIT 16K OTP 30MHZ 40-DIP
• Manufacturer: Atmel
• Series: 87Cr

Specifications of TS87C51RB2-LIA

• Core Processor: 8051
• Core Size: 8-Bit
• Speed: 30/20MHz
• Connectivity: UART/USART
• Peripherals: POR, PWM, WDT
• Number Of I /o: 32
• Program Memory Size: 16KB (16K x 8)
• Program Memory Type: OTP
• Ram Size: 512 x 8
• Voltage - Supply (vcc/vdd): 2.7 V ~ 5.5 V
• Oscillator Type: Internal
• Operating Temperature: -40°C ~ 85°C
• Package / Case: 40-DIP (0.600", 15.24mm)
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Eeprom Size: -
• Data Converters: -

Figure 9-2.
9.4
9.4.1
10. Signature Bytes
56
EPROM Erasure (Windowed Packages Only)
AT/TS8xC51Rx2
Erasure Characteristics
Control signals
Programming and Verification Signal’s Waveform
ALE/PROG
A0-A12
EA/VPP
D0-D7
The encryption array cannot be directly verified. Verification of the encryption array is done by
observing that the code array is well encrypted.
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).
The recommended erasure procedure is exposure to ultraviolet light (at 2537 Å) to an integrated
dose at least 15 W-sec/cm
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 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 sub-
jects the device to this type of exposure, it is suggested that an opaque label be placed over the
window.
The
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.
12.75V
5V
0V
TS83/87C51RB2/RC2/RD2
Programming Cycle
Signature Bytes Content
Location
Data In
30h
31h
60h
100µs
2
. Exposing the EPROM to an ultraviolet lamp of 12,000 µW/cm
has four signature bytes in location 30h, 31h, 60h and 61h. To
Contents
7Ch
58h
57h
Read/Verify Cycle
Data Out
Comment
Manufacturer Code: Atmel
Family Code: C51 X2
Product name: TS83C51RD2
4188F–8051–01/08
2
rat-