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10007175-02 KAT4000 User’s Manual
11-1
Section 11
Real-Time Clock
The standard Real-Time Clock (RTC) for the KAT4000 is provided by an M41T00 device from
STMicroelectronics. This device has power sense circuitry and uses eight bytes of non-vola-
tile RAM for the clock/calendar function. The M41T00 is powered from the +3.3 volt rail
during normal operation, and uses a single, super capacitor which provides a minimum two
hour backup.
BLOCK DIAGRAM
Figure 11-1: M41T00 Real-Time Clock Block Diagram
OPERATION
The M41T00 clock operates as a slave device on the serial bus. To obtain access, the RTC
implements a start condition followed by the correct slave address (D0h). Access the eight
bytes in the following order:
1
Seconds register
2
Minutes register
3
Century/Hours register
4
Day register
5
Date register
6
Month register