Integrated Microcontroller Reference Manual

MCF52211 ColdFire® Integrated Microcontroller Reference Manual, Rev. 2
Freescale Semiconductor 11-1
Chapter 11
Real-Time Clock
11.1 Introduction
This section discusses how to operate and program the real-time clock (RTC) module that maintains the
system clock, provides stopwatch, alarm, and interrupt functions, and supports the following features.
11.1.1 Overview
Figure 11-1 is a block diagram of the Real-Time Clock (RTC) module. It consists of the following blocks:
• Time-of-day (TOD) clock counter
•Alarm
• Minute stopwatch
• Associated control and bus interface hardware
Figure 11-1. Real-Time Clock Block Diagram
11.1.2 Features
The RTC module includes the following features:
• Full clock—days, hours, minutes, seconds
• Minute countdown timer with interrupt
• Programmable daily alarm with interrupt
• Once-per-day, once-per-hour, once-per-minute, and once-per-second interrupts
SECOND MINUTE
INTERRUPT
CONTROL
INTERRUPT
ENABLE
CLOCK
CONTROL
INTERRUPT
STATUS
ALARM COMPARATOR
SECOND
LATCH
MINUTE
LATCH
HOUR
LATCH
DATA
BUS CONTROL
ADDRESS
MINUTE STOPWATCH
1 PPM
IPBUS
DECODE
HOUR DAY
TOD CLOCK
1 Hz Input CLock
1 PPH 1 PPD
RTC_INT