GPR25L12805F datasheet(38/58 Pages) GENERALPLUS

38 / 58 page

GPR25L12805F

Proprietary & Confidential

Nov. 23, 2017

Version: 1.1

First, the SPB lock bit must be cleared by PASSWD unlock

command if lock register bit2 is set to "0" or by a power-on cycle or

hardware reset if lock register bit1 is set to "0".

The SPBs can

then be changed to reflect the desired settings.

Setting the SPB

Lock Bit once again locks the SPBs, and the device operates

normally again.

To verify the programming state of the SPB for a

given sector, issuing a SPB Read Command to the device is

required.

Note:

1. Once SPB Lock Bit is set, its Program or erase command will not be

executed and times-out without programming or erasing the SPB.

SPB Register (SPBR)

Bit

Description

Bit Status

Default

Type

7 to 0

SPB (Solid protected Bit)

00h= SPB for the sector address unprotected

FFh= SPB for the sector address protected

00h

Non-volatile

Figure 63. Read SPB Status (RDSPB) Sequence

Note: One dummy byte follow 3-byte address.

Figure 64. SPB Erase (ESSPB) Sequence

Figure 65. SPB Program (WRSPB) Sequence

Note: One dummy byte follow 3-byte address.

9.37. Dynamic Write Protection Bits

The Dynamic Protection allows the software application to easily

protect sectors against inadvertent change.

However, the

protection can be easily disabled when changes are necessary.

All Dynamic Protection bits (DPB) are volatile and assigned to

each sector.

They can be modified individually.

DPBs provide

the protection scheme only for unprotected sectors that have their

SPBs cleared.

To modify the DPB status by issuing the DPB

Program command, then placing each sector in the protected or

unprotected state separately.

After the DPB state is set to "0", the

sector may be modified depending on the SPB state of that sector.

The DPBs are protected (FFh) upon power up or reset.

Program

or erase function can only be operated after the unlock instruction

is conducted.

DPB Register (DPBR)

Bit

Description

Bit Status

Default

Type

7 to 0

DPB (Dynamic protected Bit)

00h=DPB for the sector address unprotected

FFh=DPB for the sector address protected

FFh

Volatile

Figure 66. Read DPB Register (RDDPB) Sequence

Note: One dummy byte follow 3-byte address.

Figure 67. Write DPB Register (WRDPB) Sequence

Note: One dummy byte follow 3-byte address.

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