MCF51CN128 Reference Manual, Rev. 6
Freescale Semiconductor
12-1
Chapter 12
Real-Time Counter (RTC)
12.1
Introduction
The Real-Time Counter (RTC) module consists of one 8-bit counter, one 8-bit comparator, several
binary-based and decimal-based prescaler dividers, two clock sources, and one programmable periodic
interrupt. This module can be used for time-of-day, calendar or any task scheduling functions. It can also
serve as a cyclic wakeup from low power modes without the need of external components.
NOTE
•
For details on low-power mode operation, refer to
in
Chapter 3, “Modes of Operation
”.
•
Use pin mux control registers from
Section 2.3, “Pin Mux Controls
” to
assign RTC signals to the MCF51CN128 package pins.
•
Most pin functions default to GPIO and must be software configured
before using RTC.
