Chip Enable Input

Hi All,
Simple questions.

What is Chip Enable ? ( a PIO of flash memory )

All other PIO will only funtion correct until Chip Enable is high?

Best regards,
Boki.

 

Yes. It allows you to select amongst different peripherals.
The correct level, Low or High is according to the datasheet.

Rene

 

Chip Enable is usually active *low* in fact.

When CE isn't asserted, it's as if the chip wasn't there essentially.


Graham

 

When CE is false (low), the outputs and inputs are in tri-state or high
impedance, it is as if
the chip were not there. In fact the chip goes into a low power state for
minimum
drain on the supply. Micro amps of drain is common in this mode.

CE must be true (high) for the device to operate.

OE or Output Enable allows for the address bus (and select logic) to access
the device without
causing data to appear on the data bus. Think of an EEPROM which is being
written, you
would not want the data, which is being changed, to be available until the
write operation
is finished.

 

Got it!
Thank you all for the information.

Best regards,
Boki.