AT25SL321 datasheet(27/82 Pages) RENESAS

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DS-AT25SL321-112 Rev. J

Page 27

Nov 1, 2022

AT25SL321 Datasheet

8.8

Read Data (03h)

The Read Data command is used to read data out from the memory. The command is initiated by driving the CS

pin low and then sending the command code 03h, followed by a 24-bit address (A23- A0), onto the SI pin. After

the address is received, the data byte of the addressed memory location is shifted out on the SO pin at the falling

edge of SCK with the most significant bit (MSB) first. The address is automatically incremented to the next higher

address after byte of data is shifted out allowing for a continuous stream of data. This means that the entire

memory can be accessed with a single command as long as the clock continues.

The command is completed by driving CS high. The Read Data command sequence is shown in Figure 13. If a

Read Data command is issued while an Erase, Program or Write Status Register cycle is in process (BUSY = 1)

the command is ignored and does not have any effect on the current cycle. The Read Data command allows clock

rates from D.C. to a maximum of fR (see Section 9.8, AC Electrical Characteristics).

Figure 13. Read Data Command

8.9

Fast Read (0Bh)

The Fast Read command can operate at the highest possible frequency of FR. The OBh command is driven onto

the SI pin, followed by the 24-bit address, and is latched on the rising edge of SCK. The address is then followed

by 8 dummy clocks as shown in Figure 14. The dummy clocks allows the internal circuits time to set up the initial

address. During the dummy clocks, the data value on the SO pin is a don’t care. Data of each bit shifts out on the

falling edge of SCK.

Figure 14. Fast Read Command (SPI Mode)

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DATA BYTE 1

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SCK

234

579

810

High-Impedance

24-Bit Address

Command

0Bh

SCK

High-Impedance

Dummy Clocks

Data Out

Mode 3

Mode 0

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