S-25C080A H Series

17

6. Read memory data (READ)

The READ operation is shown below. Input the instruction code and the address from serial data input (SI) after

inputting “L” to the chip select ( CS ). The input address is loaded to the internal address counter, and data in the

address is output from the serial data output (SO).

Next, by inputting the serial clock (SCK) keeping the chip select ( CS ) in “L”, the address is automatically incremented

so that data in the following address is sequentially output. The address counter rolls over to the first address by

increment in the last address.

To finish the Read cycle, set CS to “H”. It is possible to raise the chip select always during the cycle. During Write, the

READ instruction code is not be accepted or operated.

SO

SCK

WP

CS

SI

Instruction

High-Z

12345678

High / Low

910

11

21

22

23

24

25

16-bit Address

A15 A14 A13

A0

A1

A2

A3

Outputs the First Byte

D4

D5

D6

D7

26

27

28

29

30

31

32

D0

D1

D2

D3

D7

Outputs

the Second

Remark The higher addresses A15 to A10 = Don’t care.

Figure 15 READ Operation