Rainbow Electronics AT25256 - Manual (Page 6)

6
AT25128/256
3262C–SEEPR–6/03
SPI Serial Interface
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 1. All instructions, addresses, and data are
transferred with the MSB first and start with a high-to-low CS transition..
AT25128/256
Table 1. Instruction Set for the AT25128/256
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