CY14B101PA-SFXI データシートの表示（PDF） - Cypress Semiconductor
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CY14B101PA-SFXI Datasheet PDF : 43 Pages
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CY14C101PA
CY14B101PA
CY14E101PA
SPI Operating Features
Power-Up
Power-up is defined as the condition when the power supply is
turned on and VCC crosses Vswitch voltage.
As described earlier, at power-up nvSRAM performs a Power-Up
RECALL operation for tFA duration during which, all memory
accesses are disabled. The HSB pin can be probed to check the
Ready/Busy status of nvSRAM after power-up.
The following are the device status after power-up:
■ Selected (Active power mode) if CS pin is LOW
■ Deselected (Standby power mode) if CS pin is HIGH
■ Not in the Hold condition
■ Status Register state:
❐ Write Enable (WEN) bit is reset to ‘0’.
❐ WPEN, BP1, BP0 unchanged from previous STORE
operation
The WPEN, BP1, and BP0 bits of the Status Register are
nonvolatile bits and remain unchanged from the previous
STORE operation.
Power-Down
At power-down (continuous decay of VCC), when VCC drops from
the normal operating voltage and below the VSWITCH threshold
voltage, the device stops responding to any instruction sent to it.
If a write cycle is in progress and the last data bit D0 has been
received when the power goes down, it is allowed tDELAY time to
complete the write. After this, all memory accesses are inhibited
and a conditional AutoStore operation is performed (AutoStore is
not performed if no writes have happened since the last RECALL
cycle). This feature prevents inadvertent writes to nvSRAM from
happening during power-down. However, to avoid the possibility
of inadvertent writes during power-down, ensure that the device
is deselected and is in standby power mode and the CS follows
the voltage applied on VCC.
Active Power and Standby Power Modes
When CS is LOW, the device is selected and is in the active
power mode. The device consumes ICC current, as specified in
DC Electrical Characteristics on page 30. When CS is HIGH, the
device is deselected and the device goes into the standby power
mode after tSB time if a STORE or RECALL cycle is not in
progress. If a STORE/RECALL cycle is in progress, the device
goes into the standby power mode after the STORE/RECALL
cycle is completed. In the standby power mode the current drawn
by the device drops to ISB.
Document Number: 001-54392 Rev. *L
Page 8 of 43
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