SST26VF016B-104VSLASHSN datasheet(31/84 Pages) MICROCHIP

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DS20005262G-page 31

SST26VF016B

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 Configura-

tion Register (RDCR) commands output the contents of

the STATUS and Configuration registers. These com-

mands function in both SPI and SQI modes. The STA-

TUS 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 Reg-

ister command cycle (05H) or the Read Configuration

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)

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

Dummy

Status Byte Status Byte

Status Byte

MODE 3

SCK

CE#

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

05 or 35H

MODE 0

High-Impedance

Status or Configuration

MSb

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