AT89S2051 Atmel Corporation, AT89S2051 Datasheet - Page 28
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AT89S2051
Manufacturer Part Number
AT89S2051
Description
Manufacturer
Atmel Corporation
Specifications of AT89S2051
Flash (kbytes)
2 Kbytes
Max. Operating Frequency
24 MHz
Cpu
8051-12C
Max I/o Pins
15
Uart
1
Sram (kbytes)
0.25
Operating Voltage (vcc)
2.7 to 5.5
Timers
2
Isp
SPI
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Company
Part Number
Manufacturer
Quantity
Price
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Manufacturer:
ATMEL
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918
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Part Number:
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Part Number:
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Company:
Part Number:
AT89S2051-24SU
Manufacturer:
MICROCHIP
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Part Number:
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Quantity:
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30. Read Atmel Signature Row
28
AT89S2051/S4051
Function:
Usage:
Figure 30-1. Read Atmel Signature Row Sequence
1. Reads 1 to 32 bytes of data from the Atmel Signature Row.
2. X-address (page) should be 01H from a previous Load-X command.
3. Y-address (offset) incremented by positive pulse on XTAL1.
1. Execute the Load-X command to set the page to 01H and reset the offset.
2. Apply “1000” TestCode to P3.7, P3.5, P3.4, P3.3.
3. Read 8-bit data on Port P1.
4. For additional bytes (up to 32), pulse XTAL1 high for at least 100 ns to increment the Y-
address and repeat step 3. The address will change on the falling edge of XTAL1.
RDY/BSY
P3.3 - P3.7
P1.0 - P1.7
XTAL1
P3.2
01H
1101
DOUT0
1000
DOUT1
DOUT N-1
3390E–MICRO–6/08