CY14B256KA

Document #: 001-55720 Rev. *C

Page 10 of 27

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 to be informed

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

Figure 5. Interrupt Block Diagram

Xout

Xin

Y1

C2

C1

Recommended Values

Note: The recommended values for C1 and C2 include

board trace capacitance.

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

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