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SST25VF016B-50-4I-S2AE 数据手册 - Microchip（微芯）

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SST25VF016B-50-4I-S2AE数据手册

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SST25VF016B

DS20005044C-page 6  2015 Microchip Technology Inc.

4.2.1 WRITE PROTECT PIN (WP#)

The Write Protect (WP#) pin enables the lock-down

function of the BPL bit (bit 7) in the status register.

When WP# is driven low, the execution of the Write-

Status-Register (WRSR) instruction is determined by

the value of the BPL bit (see

Table 4-1). When WP# is

high, the lock-down function of the BPL bit is disabled.

4.3 Status Register

The software status register provides status on

whether the flash memory array is available for any

Read or Write operation, whether the device is Write

enabled, and the state of the Memory Write protection.

During an internal Erase or Program operation, the sta-

tus register may be read only to determine the comple-

tion of an operation in progress.

Table 4-2 describes

the function of each bit in the software status register.

4.3.1 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.

4.3.2 WRITE ENABLE LATCH (WEL)

The Write-Enable-Latch (WEL) 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 instructions

4.3.3 AUTO ADDRESS INCREMENT (AAI)

The Auto Address Increment Programming-Status bit

provides status on whether the device is in Auto

Address Increment (AAI) programming mode or Byte-

Program mode. The default at power up is Byte-Pro-

gram mode.

TABLE 4-1: CONDITIONS TO EXECUTE WRITE-STATUS-REGISTER (WRSR) INSTRUCTION

WP# BPL Execute WRSR Instruction

L1Not Allowed

L0Allowed

HXAllowed

TABLE 4-2: SOFTWARE STATUS REGISTER

Bit Name Function

Default at

Power-up Read/Write

0 BUSY 1 = Internal Write operation is in progress

0 = No internal Write operation is in progress

1 WEL 1 = Device is memory Write enabled

0 = Device is not memory Write enabled

2 BP0 Indicate current level of block write protection (See

Table 4-3) 1R/W

3 BP1 Indicate current level of block write protection (See

Table 4-3) 1R/W

4 BP2 Indicate current level of block write protection (See

Table 4-3) 1R/W

5 BP3 Indicate current level of block write protection (See

Table 4-3) 0R/W

6 AAI Auto Address Increment Programming status

1 = AAI programming mode

0 = Byte-Program mode

7 BPL 1 = BP3, BP2, BP1, BP0 are read-only bits

0 = BP3, BP2, BP1, BP0 are read/writable

0R/W

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