AT45DB321E datasheet(8/80 Pages) RENESAS

8 / 80 page

DS-AT45DB321E-8784 Rev. N

Page 8

9/1/23

AT45DB321E Datasheet

Write Protect

When the WP pin is asserted, all sectors specified for protection by the Sector Protection

Enable Sector Protection command has been issued or not. The WP pin functions

independently of the software controlled protection method. After the WP pin goes low, the

contents of the Sector Protection Register cannot be modified.

If a program or erase command is issued to the device while the WP pin is asserted, the

device simply ignores the command and perform no operation. The device returns to the idle

state once the CS pin has been deasserted. The Enable Sector Protection command and the

Sector Lockdown command, however, are recognized by the device when the WP pin is

asserted.

The WP pin is internally pulled-high and can be left floating if hardware controlled protection is

not used. However, it is recommended that the WP pin also be externally connected to VCC

whenever possible.

Low

Input

RESET

Reset

A low state on the reset pin (RESET) terminates the operation in progress and reset the

internal state machine to an idle state. The device remains in the reset condition as long as a

low level is present on the RESET pin. Normal operation can resume once the RESET pin is

brought back to a high level.

The device incorporates an internal power-on reset circuit, so there are no restrictions on the

RESET pin during power-on sequences. If this pin and feature is not used, then it is

recommended that the RESET pin be driven high externally.

Low

Input

VCC

Device Power Supply

The VCC pin is used to supply the source voltage to the device. Operations at invalid VCC

voltages can produce spurious results and must not be attempted.

—

Power

GND

Ground

The ground reference for the power supply. GND must be connected to the system ground.

—

Ground

Symbol

Name and Function

Asserted

State

Type

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