MFC2000 datasheet(345/426 Pages) ETC

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Multifunctional Peripheral Controller 2000

MFC2000

100723A

Conexant

18-1

18. Real-Time Clock

18.1 Description

The Real-Time Clock (RTC) circuit is required to maintain current time information under MFC2000 primary power

and battery backup conditions.

The RTC Circuit consists of six binary counters that track seconds, minutes, hours, days, months, and years

elapsed since the reference year, 1992. Each counter can be read from the appropriate register described. The

tracking range of the RTC is up to 32 years, and automatic compensation is made for leap years.

A 32768 Hz signal is required to operate RTC counters and logic. A 32768 Hz (watch) crystal should be used.

The RTC block diagram is illustrated in Figure 18-1.

15 B IT

PR E SC A L ER

6 B IT

SE COND S

6 B IT

M INUT ES

5 B IT

HO UR S

1 Hz

C O = 6 0

C O = 60

CO =24

32 768 H z

BU SY

DE TEC T

BUS Y F LAG CLE AR

5 B IT

DA YS

4 B IT

M O NT HS

5 BIT

YE AR S

C O = 28,29 ,

30, or 30

CO =12

MO NT H

DE CO D ER

LEA P YE A R

DE COD ER

3 S TA TE

DRIVE R

BU S Y F L A G

Figure 18-1. RTC Block Diagram

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