Datasheet

 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

0 234567891011 29303132333435363738391

0100000123 22 21 20 210

76543210

Instruction 24-bit Address

Data Out

High-Impedance