Datasheet
2015 Microchip Technology Inc. DS20005119G-page 31
SST26VF064B / SST26VF064BA
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 T
PSID,
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
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-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)
25119 F11.1
MODE 3 0
SCK
SIO(3:0)
CE#
C1 C0
MODE 0
2
XX
MSN
LSN
4
H0 L0
6
H0 L0
8
H0 L0
Dummy Data Byte Data Byte Data Byte
Note: MSN = Most Signif-
icant Nibble; LSN = Least Significant Nibble, C[1:0]=05H or 35H
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14
25119 F62.0
MODE 3
SCK
SI
SO
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
Register Out
MSB
MSB