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CY14B104M-ZSP25XI Datasheet(PDF) 10 Page - Cypress Semiconductor

Part # CY14B104M-ZSP25XI
Description  4-Mbit (512 K 횞 8/256 K 횞 16) nvSRAM with Real Time Clock
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Manufacturer  CYPRESS [Cypress Semiconductor]
Direct Link  http://www.cypress.com
Logo CYPRESS - Cypress Semiconductor

CY14B104M-ZSP25XI Datasheet(HTML) 10 Page - Cypress Semiconductor

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CY14B104K, CY14B104M
Document Number: 001-07103 Rev. *Z
Page 10 of 34
Flags Register
The flags register has three flag bits: WDF, AF, and PF, which can be used to generate an interrupt. These flags are set by the watchdog
timeout, alarm match, or power fail monitor respectively. The processor can either poll this register or enable interrupts when a flag
is set. These flags are automatically reset when the register is read. The flags register is automatically loaded with the value 0x00 on
power-up (except for the OSCF bit. See Stopping and Starting the Oscillator on page 8).
Figure 4. RTC Recommended Component Configuration [10]
Recommended Values
Y1 = 32.768 kHz (12.5 pF)
C1 = 12 pF
C2 = 69 pF
Note The recommended values for C1 and C2 include
board trace capacitance.
Xout
Xin
Y1
C2
C1
Figure 5. Interrupt Block Diagram
WDF - Watchdog Timer Flag
WIE - Watchdog Interrupt
PF - Power Fail Flag
PFE - Power Fail Enable
AF - Alarm Flag
AIE - Alarm Interrupt Enable
P/L - Pulse Level
H/L - High/Low
Enable
Watchdog
Timer
Power
Monitor
Clock
Alarm
VINT
WDF
WIE
PF
PFE
AF
AIE
P/L
Pin
Driver
H/L
INT
VCC
VSS
Note
10. For nonvolatile static random access memory (nvSRAM) real time clock (RTC) design guidelines and best practices, see application note AN61546.


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