Cypress CY14B256K manual Software Controlled STORE/RECALL Cycles 20

Page 20

CY14B256K

Software Controlled STORE/RECALL Cycles [20, 21]

Parameter	Alt.	Description	25 ns		35 ns		45 ns		Unit
Parameter	Parameter	Description	Min	Max	Min	Max	Min	Max	Unit
tRC	tAVAV	STORE/RECALL Initiation Cycle Time	25		35		45		ns
tSA	tAVEL	Address Setup Time	0		0		0		ns
tCW	tELEH	Clock Pulse Width	20		25		30		ns
tHA	tEHAX	Address Hold Time	1		1		1		ns
tRECALL		RECALL Duration		170		170		170	μs

Figure 13. CE Controlled Software STORE/RECALL Cycle [21]

ADDRESS

CE

OE

DQ (DATA)

tRC

ADDRESS # 1

tSA					tSCE
tSA					tSCE

tHA

DATA VALID

tRC

ADDRESS # 6

tSTORE / tRECALL

HIGH IMPEDANCE

DATA VALID

Figure 14. OE Controlled Software STORE/RECALL Cycle [21]

ADDRESS

CE

OE

tRC

ADDRESS # 1

tSA					tSCE
tSA					tSCE

tHA

tRC

ADDRESS # 6

tSTORE / tRECALL

DQ (DATA)

DATA VALID

DATA VALID	HIGH IMPEDANCE

Notes

20.The software sequence is clocked with CE controlled or OE controlled READs.

21.The six consecutive addresses are read in the order listed in the Mode Selection on page 6. WE is HIGH during all six consecutive cycles.

Document Number: 001-06431 Rev. *H

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Contents Features Logic Block DiagramFunctional Description Cypress Semiconductor Corporation 198 Champion CourtPin Configurations Pin DefinitionsHardware Store HSB Operation Device OperationAutoStore Operation Hardware Recall Power Up Software StoreSoftware Recall Data ProtectionLow Average Active Power Best Practices Current versus Cycle TimeMode Selection A13-A0 Power Real Time Clock Operation Calibrating the Clock AlarmWatchdog Timer Power Monitor InterruptsInterrupt Register Flags RegisterInterrupt Block Diagram RTC Register Map5 BCD Format Data Function/Range WDF OscfRegister Map Detail Time Keeping Years 0x7FFF 10s Years Time Keeping Months 0x7FFE 10s MonthDate Time Keeping Hours 0x7FFB Time Keeping Minutes 0x7FFAAlarm Day 0x7FF5 Register Map Detail Calibration/Control 0X7FF80x7FF7 Interrupt Status/Control 0x7FF6Register Map Detail Alarm Hours 0x7FF4 10s Alarm Hours To ignore the hours value Alarm Minutes 0x7FF3Alarm Seconds 0x7FF2 When the Flags register is read or on power-upDC Electrical Characteristics Maximum RatingsOperating Range RangeData Retention and Endurance CapacitanceThermal Resistance AC Test ConditionsAC Switching Characteristics Parameter Sram Read CycleParameter Cypress Alt Description 25 ns 35 ns 45 ns Min Max Unit Sram Write CycleAutoStore or Power Up Recall Parameter Description CY14B256K Unit Min MaxSoftware Controlled STORE/RECALL Cycles 20 Parameter Alt Description 25 ns 35 ns 45 ns Unit Min MaxSoft Sequence Commands Hardware Store CycleTruth Table For Sram Operations RTC CharacteristicsInputs and Outputs Mode Power Part Numbering Nomenclature CY 14 B 256 K SP 25 X C T Ordering Information Package Diagrams Pin Shrunk Small Outline PackageDocument History Orig. of Change Submission Description of Change DateUpdated Features section Updated Reading the clock, Backup Power, StoppingStarting the Oscillator and Alarm descriptions under RTC Added default values to RTC Register Map tableUSB Sales, Solutions, and Legal InformationWorldwide Sales and Design Support Products PSoC Solutions