at25040 ATMEL Corporation, at25040 Datasheet - Page 6

• Manufacturer Part Number: at25040
• Description: Spi Serial Eeproms 1k 128 X 8 2k 256 X 8 4k 512 X 8
• Manufacturer: ATMEL Corporation

SPI Serial Interface
Functional
Description
6
AT25010/020/040
The AT25010/020/040 is designed to interface directly with the synchronous serial
peripheral interface (SPI) of the 6805 and 68HC11 series of microcontrollers.
The AT25010/020/040 utilizes an 8-bit instruction register. The list of instructions and
their operation codes are contained in Table 1. All instructions, addresses, and data are
transferred with the MSB first and start with a high-to-low CS transition.
Table 1. Instruction Set for the AT25010/020/040
Note:
Instruction Name
WREN
WRDI
RDSR
WRSR
READ
WRITE
“A” represents MSB address bit A8.
Instruction Format
0000 X110
0000 X100
0000 X101
0000 X001
0000 A011
0000 A010
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
0606M–SEEPR–06/03