25LC1024 datasheet(7/34 Pages) MICROCHIP

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 2010 Microchip Technology Inc.

DS22064D-page 7

25LC1024

Read Sequence

The device is selected by pulling CS low. The 8-bit

READ instruction is transmitted to the 25LC1024

followed by the 24-bit address, with seven MSBs of the

address being “don’t care” bits. After the correct READ

instruction and address are sent, the data stored in the

memory at the selected address is shifted out on the

SO pin.

The data stored in the memory at the next address can

be read sequentially by continuing to provide clock

pulses. The internal Address Pointer is automatically

incremented to the next higher address after each byte

of data is shifted out. When the highest address is

reached (1FFFFh), the address counter rolls over to

address, 00000h, allowing the read cycle to be contin-

ued indefinitely. The read operation is terminated by

raising the CS pin (Figure 2-1).

FIGURE 2-1:

READ SEQUENCE

SCK

23456789 10 11

29 30 31 32 33 34 35 36 37 38 39

23 22 21 20

210

765

43210

Instruction

24-bit Address

Data Out

High-Impedance

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