AT45DB021E datasheet(32/69 Pages) RENESAS

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DS-AT45DB021E-8789 Rev. N

Page 32

3/24/26

AT45DB021E Datasheet

1. R = Read only.

11.4.1

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.

11.4.2

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.

11.4.3

DENSITY Bits

The device density is indicated using the DENSITY bits. For the AT45DB021E, 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 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 devices.

11.4.4

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.

11.4.5

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 “power of 2” binary page size (256 bytes) or the standard DataFlash page size (264 bytes).

11.4.6

EPE Bit

The EPE bit indicates whether the last erase or program operation completed successfully or not. If at least one

byte during the erase or program operation did not erase or program properly, then the EPE bit is set to the Logic

1 state. The EPE bit is not set if an erase or program operation aborts for any reason, such as an attempt to erase

or program a protected region. The EPE bit is updated after every erase and program operation.

11.4.7

SLE Bit

The SLE bit indicates whether or not the Sector Lockdown command is enabled or disabled. If the SLE bit is a

Logic 1, then the Sector Lockdown command is still enabled and sectors can be locked down. If the SLE bit is a

Logic 0, then the Sector Lockdown command has been disabled and no further sectors can be locked down.

Table 20. Status Register Format – Byte 2

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.

SLE

Sector Lockdown Enabled

Sector Lockdown command is disabled.

Sector Lockdown command is enabled.

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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