MCF52235 ColdFire® Integrated Microcontroller Reference Manual, Rev. 6
Freescale Semiconductor
8-1
Chapter 8
Real-Time Clock
8.1
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.
8.1.1
Overview
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 8-1. Real-Time Clock Block Diagram
8.1.2
Features
The RTC module includes the following features:
•
Full clock—days, hours, minutes, seconds
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
Because
of
an
order
from
the
United
States
International
Trade
Commission,
BGA-packaged
product
lines
and
part
numbers
indicated
here
currently
are
not
available
from
Freescale
for
import
or
sale
in
the
United
States
prior
to
September
2010:MCF52234CVM60,
MCF52235CVM60
