LE25S81MC

No.A2287-8/23

Description of Commands and Their Operations

A detailed description of the functions and operations corresponding to each command is presented below.

1. Standard SPI read

There are two read commands, the standard SPI read command and High-speed read command.

1-1. Read command

Consisting of the first through fourth bus cycles, the 4 bus cycle read command inputs the 24-bit addresses following

(03h). The data is output from SO on the falling clock edge of fourth bus cycle bit 0 as a reference. "Figure 4-a Read"

shows the timing waveforms.

Figure 4-a Read

1-2. High-speed read command

Consisting of the first through fifth bus cycles, the High-speed read command inputs the 24-bit addresses and 8 dummy

bits following (0Bh). The data is output from SO using the falling clock edge of fifth bus cycle bit 0 as a reference.

"Figure 4-b High-speed Read" shows the timing waveforms.

Figure 4-b High-speed Read

N+2

N+1

N

CS

High Impedance

DATA

DATA

DATA

SCK

SO

SI

03h

Add.

Add.

Add.

15

MSB

MSB

MSB

0

1

2

3

4

5

6

7

8

23

16

24

31

39

47

8CLK

Mode0

Mode3

32

40

N+2

N+1

N

CS

High Impedance

DATA

DATA

DATA

SCK

SO

SI

0Bh

Add.

Add.

Add.

X

15

MSB

MSB

MSB

0

1

2

3

4

5

6

7

8

23

16

24

31 32

39 40

47 48

55

Mode3

Mode0

8CLK

MSB