Chapter 17 - Real-Time Clock; Rtc Features; Figure 17-1. Rtc Block Diagram - Sharp Blue Treak LH75400 User Manual

System-on-chip preliminary

Table of Contents

Real-Time Clock

The Real Time Clock (RTC) is an AMBA slave module that connects to the APB. The RTC

can provide a basic alarm function or act as a long-time base counter. This is achieved by

generating an interrupt signal after counting for a programmed number of cycles of an RTC

input. Counting in 1-second intervals is achieved using a 1 Hz clock input to the RTC.

Figure 17-1 shows a block diagram of the RTC.

The RTC provides the following features:

• AMBA APB interface

• 32-bit up-counter with programmable load

• Programmable 32-bit match Compare Register

• Software-maskable interrupt that is set when the Counter and Compare Registers have

identical values.