IS25LE512M-RGLA3:P-TY datasheet(37/189 Pages) ISSI

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IS25LE512M

IS25WE512M

Integrated Silicon Solution, Inc.- www.issi.com

Rev. A6

06/16/2025

PPBLK bit: The PPB Lock bit is a volatile bit for protecting all PPB bits. When cleared to 0, it locks all PPBs, when

set to 1, it allows the PPBs to be changed. The WRPLB command is used to clear the PPB Lock bit to 0. The PPB

Lock bit must be cleared to 0 only after all the PPBs are configured to the desired settings.

In Persistent Protection mode, the PPB Lock bit is set to 1 during POR or Hardware Reset. When cleared to 0, no

software command sequence can set the PPB Lock bit to 1, only another Hardware Reset or power-up can set the

PPB Lock bit.

In the Password Protection mode, the PPB Lock bit is cleared to 0 during POR or Hardware Reset. The PPB Lock

bit can only be set to 1 by the Unlock Password command.

FREEZE bit: FREEZE b

it, when set to “1”, locks the current state of BP3-0 in Status Register, TBS in the Function

writing, programming, or erasing these areas. As long as FREEZE remains cleared to logic “0”, BP3-0 in Status

writable and the Information Row is programmable. Once FREEZE has been written to a logic “1” it can only be

cleared to a logic “0” by a power-on cycle or a Hardware Reset. Software Reset will not affect the state of FREEZE.

The FREEZE is volatile and the default state of FREEZE after power-

on is “0”. The FREEZE can be set to “1” by a

SFRZ command.

6.6.4 PPB REGISTER

Related Commands: Read PPB (RDPPB FCh or 4RDPPB E2h)), Program PPB (PGPPB FDh or 4PGPPB E3h),

and Erase PPB (ERPPB E4h).

Table 6.22 PPB Register Bit Definition

Bit

Name

Definition

Default

Read-

/Write

Type

7:0

PPB

Read or Program per sector/block PPB:

00h = PPB for the sector/block addressed by the RDPPB or

PGPPB command is programmed to

“0”, protecting

that sector/block from program or erase operations.

FFh = PPB for the sector/block addressed by the RDPPB

PGPPB command is erased to

“1”, not protecting

that sector/block from program or erase operations.

FFh

R/W

Non-Volatile

6.6.5 DYB REGISTER

Related Commands: Read DYB (RDDYB FAh or 4RDDYB E0h) and Write DYB (WRDYB FBh or 4WRDYB E1h).

Table 6.23 DYB Register Bit Definition

Bit

Name

Definition

Default

Read-

/Write

Type

7:0

DYB

Read or Write per sector/block DYB:

00h = DYB for the sector/block addressed by the RDDYB

WRDYB command is cleared to

“0”, protecting that

sector/block from program or erase operations.

FFh = DYB for the sector/block addressed by the RDDYB

WRDYB command is set to

“1”, not protecting that

sector/block from program or erase operations.

FFh

R/W

Volatile

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