參數(shù)資料
型號(hào): AT25080A-10TU-2.7
廠商: ATMEL CORP
元件分類: PROM
英文描述: SPI Serial EEPROMs
中文描述: 1K X 8 SPI BUS SERIAL EEPROM, PDSO8
封裝: 4.40 MM, GREEN, PLASTIC, MO-153AA, TSSOP-8
文件頁數(shù): 26/26頁
文件大?。?/td> 801K
代理商: AT25080A-10TU-2.7
9
3347L–SEEPR–06/07
AT25080A/160A/320A/640A
3. Functional Description
The AT25080A/160A/320A/640A is designed to interface directly with the synchronous serial
peripheral interface (SPI) of the 6805 and 68HC11 series of microcontrollers.
The AT25080A/160A/320A/640A utilizes an 8-bit instruction register. The list of instructions and
their operation codes are contained in Table 3-1. All instructions, addresses, and data are trans-
ferred with the MSB first and start with a high-to-low CS transition.
WRITE ENABLE (WREN): The device will power up in the write disable state when VCC is
applied. All programming instructions must therefore be preceded by a Write Enable instruction.
WRITE DISABLE (WRDI): To protect the device against inadvertent writes, the Write Disable
instruction disables all programming modes. The WRDI instruction is independent of the status
of the WP pin.
READ STATUS REGISTER (RDSR): The Read Status Register instruction provides access to
the status register. The READY/BUSY and Write Enable status of the device can be determined
by the RDSR instruction. Similarly, the Block Write Protection Bits indicate the extent of protec-
tion employed. These bits are set by using the WRSR instruction.
Table 3-1.
Instruction Set for the AT25080A/160A/320A/640A
Instruction Name
Instruction Format
Operation
WREN
0000 X110
Set Write Enable Latch
WRDI
0000 X100
Reset Write Enable Latch
RDSR
0000 X101
Read Status Register
WRSR
0000 X001
Write Status Register
READ
0000 X011
Read Data from Memory Array
WRITE
0000 X010
Write Data to Memory Array
Table 3-2.
Status Register Format
Bit 7
Bit 6
Bit 5
Bit 4
Bit 3
Bit 2
Bit 1
Bit 0
WPEN
X
BP1
BP0
WEN
RDY
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