SST26VF032B datasheet(31/82 Pages) MICROCHIP

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DS20005218K-page 31

SST26VF032B/SST26VF032BA

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 Config-

uration Register (RDCR) commands output the contents

of the STATUS and Configuration registers. These

commands function in both SPI and SQI modes. The

STATUS register may be read at any time, even during

a write 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

tion Register 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 signal. The data output stream continues until ter-

minated by a low-to-high transition on CE#. See

Figure 5-28 and Figure 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)

Note:

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

MODE 3

SCK

SIO[3:0]

CE#

C1 C0

MODE 0

MSN LSN

H0 L0

H1 L1

HN LN

Dummy

Data Byte

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

MSB

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