AT25DF021A-DWFHT datasheet(33/59 Pages) RENESAS

33 / 59 page

DS-AT25DF021A-042 Rev. L

Page 33

8/7/23

AT25DF021A Datasheet

reset when an operation stops prematurely, the entire opcode for a program, erase, Protect Sector, Unprotect

Sector, or Write Status Register command must have been clocked into the device.

11.1.7

RDY/BSY Bit

The RDY/BSY bit is used to determine whether or not an internal operation, such as a program or erase, is in

progress. To poll the RDY/BSY bit to detect the completion of a program or erase cycle, new Status Register data

must be continually clocked out of the device until the state of the RDY/BSY bit changes from a logical 1 to a

logical 0.Note that the RDY/BSY bit can be read either from Status Register Byte 1 or from Status Register Byte 2.

See also the Active Status Interrupt command. (11.2)

Figure 26. Read Status Register

11.1.8

RSTE Bit

The RSTE bit is used to enable or disable the Reset command. When the RSTE bit is in the Logical 0 state (the

default state after power-up), the Reset command is disabled and any attempts to reset the device using the

Reset command is ignored. When the RSTE bit is in the Logical 1 state, the Reset command is enabled.

The RSTE bit retains its state as long as power is applied to the device. Once set to the Logical 1 state, the RSTE

bit remains in that state until it is modified using the Write Status Register Byte 2 command or until the device has

been power cycled. The Reset command itself does not change the state of the RSTE bit.

Table 10. Status Register Format – Byte 2

Bit[1]

1. Only bit 4 of Status Register Byte 2 is modified when using the Write Status Register Byte 2 command

Name

Type[2])

2. R/W = Readable and Writeable, R = Readable only.

Description

RES

Reserved for future use

RES

Reserved for future use

RES

Reserved for future use

RSTE

Reset Enabled

R/W

Reset command is disabled (default)

Reset command is enabled

RES

Reserved for future use

RES

Reserved for future use

RES

Reserved for future use

RDY/BSY

Ready/Busy Status

Device is ready

Device is busy with an internal operation

SCK

MSB

00000101

410 11

812

21 22

15 16

13 14

23 24

OPCODE

MSB

DDDDDD

MSB

DDDDDD

STATUS REGISTER BYTE1

STATUS REGISTER BYTE2

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