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AT45DB642D датащи(PDF) 21 Page - ATMEL Corporation

номер детали AT45DB642D
подробное описание детали  64-megabit 2.7-volt Dual-interface DataFlash
PDF  55 Pages
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производитель  ATMEL [ATMEL Corporation]
домашняя страница  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

AT45DB642D датащи(HTML) 21 Page - ATMEL Corporation

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3542F–DFLASH–09/06
AT45DB642D
Figure 10-3. Program Security Register
10.2.2
Reading the Security Register
The Security Register can be read by first asserting the CS pin and then clocking in an opcode
of 77H followed by three dummy bytes if using the serial interface and seven dummy bytes if
using the 8-bit interface. After the last don't care bit has been clocked in, the content of the
Security Register can be clocked out on the SO or I/O7 - I/O0 pins. After the last byte of the
Security Register has been read, additional pulses on the SCK/CLK pin will simply result in
undefined data being output on the SO or I/O7 - I/O0 pins.
Deasserting the CS pin will terminate the Read Security Register operation and put the SO or
I/O7 - I/O0 pins into a high-impedance state.
Figure 10-4. Read Security Register
Data Byte
n
Opcode
Byte 1
Opcode
Byte 2
Opcode
Byte 3
Opcode
Byte 4
Data Byte
n + 1
Data Byte
n + x
CS
Each transition
represents 8 bits
SI or IO
7 - IO0
Opcode
X
X
X
Data Byte
n
Data Byte
n + 1
CS
Data Byte
n + x
Each transition
represents 8 bits
SI or IO
7 - IO0
SO or IO
7 - IO0



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