AT25PE20 datasheet(25/64 Pages) DIALOG

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AT25PE20

DS-25PE20–139C–8/2018

Table 9-2.

Status Register Format – Byte 2

Note:

R = Readable only

x = Don’t care. Can be “0” or “1”.

9.4.1

RDY/BUSY Bit

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

To poll the RDY/BUSY bit to detect the completion of an internally timed operation, new Status Register data must be

continually clocked out of the device until the state of the RDY/BUSY bit changes from a Logic 0 to a Logic 1 to indicate

completion.

9.4.2

COMP Bit

The result of the most recent Main Memory Page to Buffer Compare operation is indicated using the COMP bit. If the

COMP bit is a Logic 1, then at least one bit of the data in the Main Memory Page does not match the data in the Buffer.

9.4.3

DENSITY Bits

The device density is indicated using the DENSITY bits. For the AT25PE20, the four bit binary value is 0101. The

decimal value of these four binary bits does not actually equate to the device density; the four bits represent a

combinational code relating to differing densities of DataFlash-L devices. The DENSITY bits are not the same as the

density code indicated in the JEDEC Device ID information. The DENSITY bits are provided only for backward

compatibility to older generation DataFlash-L devices.

9.4.4

PROTECT Bit

The PROTECT bit provides information to the user on whether or not the sector protection has been enabled or disabled,

either by the software-controlled method or the hardware-controlled method.

9.4.5

PAGE SIZE Bit

The PAGE SIZE bit indicates whether the Buffer size and the page size of the main memory array is configured for the

default page size (256 bytes) or the optional DataFlash-L page size (264 bytes).

Bit

Name

Type(1) Description

RDY/BUSY Ready/Busy Status

Device is busy with an internal operation.

Device is ready.

RES

Reserved for Future Use

Reserved for future use.

EPE

Erase/Program Error

Erase or program operation was successful.

Erase or program error detected.

RES

Reserved for Future Use

Reserved for future use.

RES

Reserved for Future Use

Reserved for future use.

RES

Reserved for Future Use

Reserved for future use.

RES

Reserved for Future Use

Reserved for future use.

RES

Reserved for Future Use

Reserved for future use.

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