SST38VF6401 datasheet(18/64 Pages) MICROCHIP

18 / 64 page

DS-20005015B

08/15

64 Mbit (x16) Advanced Multi-Purpose Flash Plus

SST38VF6401 / SST38VF6402 / SST38VF6403 / SST38VF6404

Not Recommended for New Designs

Protection Settings Register (PSR)

The Protection Settings Register (PSR) is a user-programmable register that allows for further custom-

ization of the SST38VF6401/6402/6403/6404 protection features. The 16-bit PSR provides four One

Time Programmable (OTP) bits for users, each of which can be programmed individually. However,

once an OTP bit is programmed to ‘0’, the value cannot be changed back to a ‘1’. The other 12 bits of

the PSR are reserved. See Table 8 for the definition of all 16-bits of the PSR.

Note that DQ4, DQ2, DQ1, DQ0 do not have to be programmed at the same time. In addition, DQ2 and

DQ1 cannot both be programmed to ‘0’. The valid combinations of states of DQ2 and DQ1 are shown in

Table 9.

The PSR can be accessed by issuing the PSR Entry command. Users can then use the PSR Program

and PSR Read commands. The PSR Exit command must be issued to leave this mode. See Table 11

for further details.

Table 8: PSR Bit Definitions

Bit

Default from Factory

Definition

DQ15-DQ5

FFFh

Reserved

DQ4

VPB power-up / hardware reset state

0 = all protected

1 = all unprotected

DQ3

Reserved

DQ2

Password mode

0 = Password only mode

1 = Pass-Through mode

DQ1

Pass-Through mode

0 = Pass-Through only mode

1 = Pass-Through mode

DQ0

SEC ID Lock Out Bit

0 = locked

1 = unlocked

T8.0 20005015

Table 9: Valid DQ2 and DQ1 Combinations

Combination

Definition

DQ2, DQ1 = 11

Pass-Through mode (factory default)

DQ2, DQ1 = 10

Pass-Through only mode

DQ2, DQ1 = 01

Password only mode

DQ2, DQ1 = 00

Not Allowed

T9.0 20005015

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