Datasheet

Jon Waddington
41
3.8 Settings
The fourth item allows the user to set the time and date using the remote control.
3.8.1 Real Time Clock
Keeping the date and time on the information system required a Real-Time Clock (RTC).
A PCF8563 is used for this purpose. It provides the month, date, day, hour, minutes and
seconds, based on a 32.768kHz crystal. The circuit diagram for the RTC is shown below
in figure 3.8.1. It uses a CR2032, 3V, battery to allow it to keep the correct time and
date while the rest of the circuit is powered down. The clock (SCL) of the I2C bus is
connected to pin 5 of the Propeller chip and the date (SDA) of the I2C bus is connected
to pin 4 of the Propeller chip.
Figure 3.8.1. Schematic of the RTC Circuit