SST26WF040BA datasheet(34/96 Pages) MICROCHIP

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SST26WF040B/040BA SST26WF080B/080BA

DS20005283C-page 34

 2014-2017 Microchip Technology Inc.

5.33

Read Block-Protection Register

(RBPR)

The Read Block-Protection Register instruction outputs

the Block-Protection register data which determines

the protection status. To execute a Read Block-Protec-

tion Register operation, the host drives CE# low, and

then sends the Read Block-Protection Register com-

mand cycle (72H). A dummy cycle is required in SQI

mode.

After the command cycle, the device outputs data on

the falling edge of the SCK signal starting with the most

significant nibble, see Table 5-6 for definitions of each

bit in the Block-Protection register. The RBPR com-

mand does not wrap around. After all data has been

output, the device will output 0H until terminated by a

low-to-high transition on CE#. Figures 5-36 and 5-37.

FIGURE 5-36:

READ BLOCK-PROTECTION REGISTER SEQUENCE (SQI)

FIGURE 5-37:

READ BLOCK-PROTECTION REGISTER SEQUENCE (SPI)

2005283 F34.2

MODE 3

SCK

SIO[3:0]

CE#

C1 C0

H0 L0

MSN LSN

H1 L1

H2 L2

H3 L3

H4 L4

HN LN

BPR [m:m-7]

BPR [7:0]

Note: MSN

= Most Significant Nibble, LSN = Least Significant Nibble

Block-Protection Register (BPR) m = 23 for SST26WF040B/040BA, m = 32 for SST26WF080B/080BA

CE#

SIO0

SCK

012345678

32 33

MODE 3

MODE 0

15 16

72H

2005283 F65.1

SIO

OP Code

Data Byte 0

Data Byte 1

Data Byte 2

Data Byte N

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