AT25DF321A datasheet(17/51 Pages) RENESAS

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3686I–DFLASH–02/2019

AT25DF321A

Figure 8-7. Program/Erase Suspend

8.6

Program/Erase Resume

The Program/Erase Resume command allows a suspended program or erase operation to be resumed and continue

programming a Flash page or erasing a Flash memory block where it left off. As with the Program/Erase Suspend command,

the Write Enable command does not need to be issued prior to the Program/Erase Resume command being issued. Therefore,

the Program/Erase Resume command operates independently of the state of the WEL bit in the Status Register.

To perform a Program/Erase Resume, the CS pin must first be asserted and the opcode of D0h must be clocked into the device.

No address bytes need to be clocked into the device, and any data clocked in after the opcode will be ignored. When the CS pin

is deasserted, the program or erase operation currently suspended will be resumed within a time of t

RES. The PS bit or the ES

bit in the Status Register will then be reset back to the logical “0” state to indicate that the program or erase operation is no

longer suspended. In addition, the RDY/BSY bit in the Status Register will indicate that the device is busy performing a

program or erase operation. The complete opcode must be clocked into the device before the CS pin is deasserted, and the CS

pin must be deasserted on an even byte boundary (multiples of eight bits); otherwise, no resume operation will be performed.

During a simultaneous Erase Suspend/Program Suspend condition, issuing the Program/Erase Resume command will result in

the program operation resuming first. After the program operation has been completed, the Program/Erase Resume command

must be issued again in order for the erase operation to be resumed.

While the device is busy resuming a program or erase operation, any attempts at issuing the Program/Erase Suspend command

will be ignored. Therefore, if a resumed program or erase operation needs to be subsequently suspended again, the system

must either wait the entire t

RES time before issuing the Program/Erase Suspend command, or it must check the status of the

RDY/BSY bit or the appropriate PS or ES bit in the Status Register to determine if the previously suspended program or erase

operation has resumed.

Figure 8-8. Program/Erase Resume

SCK

MSB

OPCODE

HIGH-IMPEDANCE

SCK

MSB

OPCODE

HIGH-IMPEDANCE

AT25DF321A Datasheet(PDF) 17 Page - Renesas Technology Corp