Cypress CY14B108K Xout Xin, WDF Watchdog Timer Flag, WIE Watchdog Interrupt, PF Power Fail Flag

Page 10

 

 

PRELIMINARY

CY14B108K, CY14B108M

 

 

 

 

 

 

 

 

 

Figure 4. RTC Recommended Component Configuration

 

 

 

 

C1

 

 

 

 

 

 

 

 

Xout

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Y1

Xin

 

 

 

C2

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Recommended Values

Y1 = 32.768 KHz (6 pF)

C1 = 21 pF

C2 = 21 pF

Note: The recommended values for C1 and C2 include board trace capacitance.

Figure 5. Interrupt Block Diagram

Watchdog

Timer

Power

Monitor

VINT

Clock

Alarm

WDF

WIE

PF

PFE

AF

AIE

 

P/L

VCC

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Pin Driver

H/L VSS

 

WDF - Watchdog Timer Flag

 

WIE - Watchdog Interrupt

 

Enable

 

PF - Power Fail Flag

INT

PFE - Power Fail Enable

AF - Alarm Flag

 

AIE - Alarm Interrupt Enable

 

P/L - Pulse Level

 

H/L - High/Low

Document #: 001-47378 Rev. **

Page 10 of 29

[+] Feedback

Page 9 Page 11
Image 10
Page 9 Page 11
Contents Functional Description FeaturesLogic Block Diagram1, 2 Cypress Semiconductor CorporationPinouts Sram Write Device OperationSram Read AutoStore OperationSoftware Recall Hardware Recall Power UpHardware Store HSB Operation Software StorePreventing AutoStore Mode SelectionA15 A05 Mode Power StoreData Protection Best Practices Noise ConsiderationsReal Time Clock Operation Watchdog Timer AlarmCalibrating the Clock Interrupts Power MonitorInterrupt Register Flags RegisterPFE Power Fail Enable WDF Watchdog Timer FlagPF Power Fail Flag AF Alarm FlagWDS OscenWDF Oscf 0xFFFF9 0x7FFF9 Time Keeping Seconds For the register is 0 toWrite only. Reading it always returns a 0xFFFF5 0x7FFF5 Alarm DayTime-base 0xFFFF6 0x7FFF6 Interrupt Status/ControlWatchdog 0xFFFF2 0x7FFF2 Alarm SecondsCenturies 0xFFFF0 0x7FFF0 Flags This condition and write 0 to clear this flagMaximum Ratings DC Electrical CharacteristicsRange Ambient Temperature Operating RangeThermal Resistance Data Retention and EnduranceCapacitance AC Test ConditionsRTC Battery Pin Voltage RTC Backup CurrentHot Temperature 85 oC RTC Capacitor Pin Voltage TOCS RTC Oscillator Time to StartParameters Sram Read Cycle AC Switching CharacteristicsSwitching Waveforms Sram Write CycleAddress Address Valid Data Output High Impedance Output Data ValidStandby Active Data Input Input Data ValidNot applicable for RTC register writes Data Input Data OutputInput Data Valid High Impedance Data Input Input Data Valid High Impedance Data OutputAutoStore/Power Up Recall Parameters Description 20 ns 25 ns 45 ns Unit Min MaxSoftware Controlled Store and Recall Cycle Description 20 ns 25 ns 45 ns Unit Min To Output Active Time when write latch not setHardware Store Cycle Hardware Store Pulse WidthInputs and Outputs Mode Power For x8 ConfigurationFor x16 Configuration Truth Table For Sram OperationsZS Tsop Part Numbering Nomenclature CY14 B 108 K ZS P 20 X C TNvsram Ordering Information Package Diagrams Pin Tsop II51-85160 New Data Sheet Sales, Solutions, and Legal InformationWorldwide Sales and Design Support Products PSoC Solutions Document History
Top Page Image Contents