SST25PF080B datasheet(6/32 Pages) MICROCHIP

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SST25PF080B

DS20005137B-page 6

 2014 Microchip Technology Inc.

4.4.1

BUSY

The Busy bit determines whether there is an internal

Erase or Program operation in progress. A “1” for the

Busy bit indicates the device is busy with an operation

in progress. A “0” indicates the device is ready for the

next valid operation.

4.4.2

WRITE ENABLE LATCH (WEL)

The Write-Enable-Latch bit indicates the status of the

internal memory Write Enable Latch. If the Write-

Enable-Latch bit is set to “1”, it indicates the device is

Write enabled. If the bit is set to “0” (reset), it indicates

the device is not Write enabled and does not accept

any memory Write (Program/Erase) commands. The

Write-Enable-Latch bit is automatically reset under the

following conditions:

• Power-up

• Write-Disable (WRDI) instruction completion

• Byte-Program instruction completion

• Auto Address Increment (AAI) programming is

completed or reached its highest unprotected

memory address

• Sector-Erase instruction completion

• Block-Erase instruction completion

• Chip-Erase instruction completion

• Write-Status-Register instruction completion

• Program SID instruction completion

• Lockout SID instruction completion

4.4.3

AUTO ADDRESS INCREMENT (AAI)

The Auto Address Increment Programming-Status bit

provides status on whether the device is in AAI pro-

gramming mode or Byte-Program mode. The default at

power up is Byte-Program mode.

4.4.4

SECURITY ID STATUS (SEC)

The Security ID Status (SEC) bit indicates when the

Security ID space is locked to prevent a Write com-

mand. The SEC is ‘1’ after the host issues a Lockout

SID command. Once the host issues a Lockout SID

command, the SEC can never be reset to ‘0’.

4.4.5

BLOCK PROTECTION (BP2, BP1,

BP0)

The Block-Protection (BP2, BP1, BP0) bits define the

size of the memory area, as defined in Table 4-3, to be

software protected against any memory Write (Pro-

gram or Erase) operation. The Write-Status-Register

(WRSR) instruction is used to program the BP2, BP1

and BP0 bits as long as WP# is high or the Block-Pro-

tect-Lock (BPL) bit is 0. Chip-Erase can only be exe-

cuted if Block-Protection bits are all 0. After power-up,

BP2, BP1 and BP0 are set to 1.

4.4.6

BLOCK PROTECTION LOCK-DOWN

(BPL)

WP# pin driven low (VIL), enables the Block-Protection-

Lock-Down (BPL) bit. When BPL is set to 1, it prevents

any further alteration of the BPL, BP2, BP1, and BP0

bits. When the WP# pin is driven high (VIH), the BPL bit

has no effect and its value is “Don’t Care”. After power-

up, the BPL bit is reset to 0.

TABLE 4-3:

SOFTWARE STATUS REGISTER BLOCK PROTECTION FOR SST25PF080B1

1. X = Don’t Care (RESERVED) default is ‘0’

Protection Level

Status Register Bit2

2. Default at power-up for BP2, BP1, and BP0 is ‘111’. (All Blocks Protected)

Protected Memory Address

BP2

BP1

BP0

8 Mbit

None

Upper 1/16

F0000H-FFFFFH

Upper 1/8

E0000H-FFFFFH

Upper 1/4

C0000H-FFFFFH

Upper 1/2

80000H-FFFFFH

All Blocks

00000H-FFFFFH

All Blocks

00000H-FFFFFH

All Blocks

00000H-FFFFFH

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