W25Q80BWSVIP datasheet(57/74 Pages) WINBOND

57 / 74 page

W25Q80BW

Publication Release Date: July 30, 2013

- 57 -

Revision J

7.2.38

Read Security Registers (48h)

The Read Security Register instruction is similar to the Fast Read instruction and allows one or more data

bytes to be sequentially read from one of the four security registers. The instruction is initiated by driving

the /CS pin low and then shifting the instruction code “48h” followed by a 24-bit address (A23-A0) and

eight “dummy” clocks into the DI pin. The code and address bits are latched on the rising edge of the CLK

pin. After the address is received, the data byte of the addressed memory location will be shifted out on

the DO pin at the falling edge of CLK with most significant bit (MSB) first. The byte address is

automatically incremented to the next byte address after each byte of data is shifted out. Once the byte

address reaches the last byte of the register (byte FFh), it will reset to 00h, the first byte of the register,

and continue to increment. The instruction is completed by driving /CS high. The Read Security Register

instruction sequence is shown in figure 36. If a Read Security Register instruction is issued while an

Erase, Program or Write cycle is in process (BUSY=1) the instruction is ignored and will not have any

effects on the current cycle. The Read Security Register instruction allows clock rates from D.C. to a

maximum of FR (see AC Electrical Characteristics).

ADDRESS

A23-16

A15-12

A11-8

A7-0

Security Register #0*

00h

0 0 0 0

Byte Address

Security Register #1

00h

0 0 0 1

0 0 0 0

Byte Address

Security Register #2

00h

0 0 1 0

0 0 0 0

Byte Address

Security Register #3

00h

0 0 1 1

0 0 0 0

Byte Address

* Please note that Security Register 0 is Reserved by Winbond for future use. It is

recommended to use Security registers 1- 3 before using register 0.

/CS

CLK

(IO

Mode 0

Mode 3

Instruction (48h)

High Impedance

24-Bit Address

Data Out 1

/CS

CLK

(IO

Dummy Byte

High Impedance

Data Out 2

= MSB

Figure 36. Read Security Registers Instruction Sequence

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