AT25128 查看數據表（PDF） - Atmel Corporation

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AT25128

SPI Serial EEPROMs

Atmel Corporation 

Figure 2. SPI Serial Interface

AT25128/256

Functional

Description

The AT25128/256 is designed to interface directly with the synchronous serial periph-

eral interface (SPI) of the 6800 type series of microcontrollers.

The AT25128/256 utilizes an 8-bit instruction register. The list of instructions and their

operation codes are contained in Table 5. All instructions, addresses, and data are

transferred with the MSB first and start with a high-to-low CS transition.

Table 5. Instruction Set for the AT25128/256

Instruction Name

Instruction Format

WREN

0000 X110

WRDI

0000 X100

RDSR

0000 X101

WRSR

0000 X001

READ

0000 X011

WRITE

0000 X010

Operation

Set Write Enable Latch

Reset Write Enable Latch

Read Status Register

Write Status Register

Read Data from Memory Array

Write Data to Memory Array

6 AT25128/256

0872O–SEEPR–03/05

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