AM1808AZCED3 datasheet(241/264 Pages) TI

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Seconds

Minutes

Hours

Days

Months

Years

Alarm

Timer

Alarm

Interrupts

Periodic

Interrupts

Counter

32kHz

Oscillator

Compensation

Week

Days

Oscillator

RTC_XI

XTAL

RTC_XO

AM1808

www.ti.com

SPRS653A – FEBRUARY 2010 – REVISED APRIL 2010

6.31 Real Time Clock (RTC)

The RTC provides a time reference to an application running on the device. The current date and time is

tracked in a set of counter registers that update once per second. The time can be represented in 12-hour

or 24-hour mode. The calendar and time registers are buffered during reads and writes so that updates do

not interfere with the accuracy of the time and date.

Alarms are available to interrupt the CPU at a particular time, or at periodic time intervals, such as once

per minute or once per day. In addition, the RTC can interrupt the CPU every time the calendar and time

registers are updated, or at programmable periodic intervals.

The real-time clock (RTC) provides the following features:

•

100-year calendar (xx00 to xx99)

•

Counts seconds, minutes, hours, day of the week, date, month, and year with leap year compensation

•

Binary-coded-decimal (BCD) representation of time, calendar, and alarm

•

12-hour clock mode (with AM and PM) or 24-hour clock mode

•

Alarm interrupt

•

Periodic interrupt

•

Single interrupt to the CPU

•

Supports external 32.768-kHz crystal or external clock source of the same frequency

•

Separate isolated power supply

Figure 6-82 shows a block diagram of the RTC.

Figure 6-82. Real-Time Clock Block Diagram

Peripheral Information and Electrical Specifications

241

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