Owner manual

AT25DQ321 [DATASHEET]

8718D–DFLASH–12/2012

12.5 Hold

The HOLD pin is used to pause the serial communication with the device without having to stop or reset the clock

sequence. The Hold mode, however, does not have an affect on any internally self-timed operations such as a program

or erase cycle. Therefore, if an erase cycle is in progress, asserting the

HOLD pin will not pause the operation and the

erase cycle will continue until it is finished.

The Hold mode can only be entered while the

CS pin is asserted. The Hold mode is activated simply by asserting the

HOLD pin during the SCK low pulse. If the HOLD pin is asserted during the SCK high pulse, then the Hold mode won’t be

started until the beginning of the next SCK low pulse. The device will remain in the Hold mode as long as the

HOLD pin

and

CS pin are asserted.

While in the Hold mode, the SO pin will be in a high-impedance state. In addition, both the SI pin and the SCK pin will be

ignored. The

WP pin, however, can still be asserted or deasserted while in the Hold mode.

To end the Hold mode and resume serial communication, the

HOLD pin must be deasserted during the SCK low pulse. If

the

HOLD pin is deasserted during the SCK high pulse, then the Hold mode won’t end until the beginning of the next SCK

low pulse.

If the

CS pin is deasserted while the HOLD pin is still asserted, then any operation that may have been started will be

aborted and the device will reset the WEL bit in the Status Register back to the Logical 0 state.

Figure 12-5. Hold Mode

HOLD

SCK

Hold HoldHold