AT25SL321 datasheet(38/82 Pages) RENESAS

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DS-AT25SL321-112 Rev. J

Page 38

Nov 1, 2022

AT25SL321 Datasheet

8.16 Quad Page Program (33h)

The Quad Page Program command is to program the memory as being 0 at previously erased memory areas.

The Quad Page Program takes four pins: IO0, IO1, IO2 and IO3 as address and data input, which can improve

programmer performance and the effectiveness of application of lower clock less than 5 MHz. System using

faster clock speed does not get more benefit for the Quad Page Program as the required internal page program

time is far more than the time data clock-in.

To use Quad Page Program, the Quad Enable bit must be set, A Write Enable command must be executed

before the device accepts the Quad Page Program command (Status Register-1, WEL = 1). The command is

initiated by driving the CS pin low then sending the command code 33h with following a 24-bit address (A23-A0)

and at least one data, into the IO pins. The CS pin must be held low for the entire length of the command while

data is being sent to the device. All other functions of Quad Page Program are perfectly same as standard

Page Program. (See Figure 27 and Figure 28).

Figure 27. Quad Page Program Command (SPI mode)

SCK

123

10 11 12 13

13 14 15 16 17 18 19

Mode 3

Mode 0

Mode 3

Mode 0

Command

33h

A23-16

A15-8

A7-0

Byte 1

Byte 2

Byte 3

Byte 253 Byte 254

Byte 255 Byte 256

MSB

AT25SL321 Datasheet(PDF) 38 Page - Renesas Technology Corp