AT25640BN-SH-B 查看數據表（PDF） - Atmel Corporation

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AT25640BN-SH-B

SPI Serial EEPROMs 32K (4096 x 8) 64K (8192 x 8)

Atmel Corporation 

AT25320B/640B

operation to the status register. The WP pin function is blocked when the WPEN bit in the status

register is “0”. This will allow the user to install the AT25320B/640B in a system with the WP pin

tied to ground and still be able to write to the status register. All WP pin functions are enabled

when the WPEN bit is set to “1”.

Figure 1-1. SPI Serial Interface

AT25320B/640B

2. Functional Description

The AT25320B/640B is designed to interface directly with the synchronous serial peripheral

interface (SPI) of the 6805 and 68HC11 series of microcontrollers.

The AT25320B/640B utilizes an 8-bit instruction register. The list of instructions and their opera-

tion codes are contained in Table 2-1. All instructions, addresses, and data are transferred with

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

Table 2-1. Instruction Set for the AT25320B/640B

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

7

8535B–SEEPR–7/08

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