SST26VF032BEUI datasheet(30/76 Pages) MICROCHIP

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SST26VF032BEUI

DS20006152A-page 30

 2019 Microchip Technology Inc.

5.28

Lockout Security ID

The Lockout Security ID instruction prevents any future

changes to the Security ID, and is supported in both

SPI and SQI modes. Prior to the operation, execute

WREN.

To execute a Lockout SID, the host drives CE# low,

sends the Lockout Security ID command cycle (85H),

then drives CE# high. Poll the BUSY bit in the software

status register, or wait TPSID, for the completion of the

Lockout Security ID operation.

5.29

Read-Status Register (RDSR) and

Read-Configuration Register

(RDCR)

The Read-Status Register (RDSR) and Read-Configu-

ration Register (RDCR) commands output the contents

of the Status and Configuration registers. These com-

mands function in both SPI and SQI modes. The Status

operation. When a Write is in progress, poll the BUSY

bit before sending any new commands to assure that

the new commands are properly received by the

device.

To Read the Status or Configuration registers, the host

drives CE# low, then sends the Read-Status-Register

command cycle (05H) or the Read Configuration Reg-

ister command (35H). A dummy cycle is required in

SQI mode. Immediately after the command cycle, the

device outputs data on the falling edge of the SCK sig-

nal. The data output stream continues until terminated

by a low-to-high transition on CE#. See Figures 5-28

and 5-29 for the instruction sequence.

FIGURE 5-28:

READ-STATUS-REGISTER AND READ-CONFIGURATION REGISTER

SEQUENCE (SQI)

FIGURE 5-29:

READ-STATUS-REGISTER AND READ-CONFIGURATION REGISTER

SEQUENCE (SPI)

20005218 F11.1

MODE 3

SCK

SIO(3:0)

CE#

C1 C0

MODE 0

MSN LSN

H0 L0

Dummy

Data Byte

Note: MSN = Most Significant Nibble; LSN = Least Significant Nibble, C[1:0]=05H or 35H

20005218 F62.1

MODE 3

SCK

CE#

Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0

05 or 35

MODE 0

HIGH IMPEDANCE

Status or Configuration

MSB

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