SST49LF016C datasheet(18/43 Pages) MICROCHIP

18 / 43 page

DS20005029B

02/16

16 Mbit LPC Serial Flash

SST49LF016C

EOL Data Sheet

Clear-Status-Register Command

The user can reset the Status register’s Block Protect Status (BPS) bit to 0 by issuing a Clear-Status-

Sector-/Block-Erase Command

The Erase Command operates on one sector or block at a time. This command requires an (arbitrary)

address within the sector or block to be erased. Note that a Sector/Block Erase operation changes all

Sector/Block byte data to FFh. If a Read operation is performed after issuing the erase command, the

device will automatically output Status Register data. The system can poll the Status Register in order

to verify the completion of the Sector/Block Erase operation (please refer to Table 10, Status Register

Definition). If a Sector/Block Erase is attempted on a locked block, the operation will fail and the data in

the Sector/Block will not be changed. In this case, the Status Register will report the error (BPS=1).

Program Command

The Program command operates on multiple bytes (Refer to Table 5). This command specifies the

address and data to be programmed. During the Program operation the device automatically outputs

the Status Register data when read. The system can poll the Status Register in order to verify the com-

pletion of the Program operation (refer to Table 10, “Software Status Register”). If a Program operation

is attempted on a locked block, the operation will fail and the data in the addressed byte will not be

changed. In this case, the Status Register will report the error (BPS=1).

Program-/Erase-Suspend or Program-/Erase-Resume Operations

The Program-Suspend and Erase-Suspend operations share the same software command sequence

(B0H). The Program-Resume and Erase-Resume operations share the same software command

sequence (D0H). See Table 8, “Software Command Sequence” on page 16.

Table 10: Software Status Register

Bit

Name

Function

RES

Reserved for future use

BPS

Block Protect Status

The Block Write-Lock bit should be interrogated only after Erase or Program command is issued.

It informs the system whether or not the selected block is locked.

BPS does not provide a continuous indication of Write-Lock bit value.

0: Block Unlocked

1: Operation Aborted, Block Write-Lock bit set.

2:5

RES

Reserved for future use

ESS

Erase Suspend Status

0: Erase in progress/completed

1: Erase suspended

WSMS

Write State Machine Status

Check WSMS to determine erase or program completion.

0: Busy

1: Ready

T10.0 20005029

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