MC68HC908LJ24 Datasheet, PDF (218/464 Pages) Motorola, Inc – Microcontrollers

Real Time Clock (RTC)
12.10.10 Day Register (DAYR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 242
12.10.11 Month Register (MTHR) . . . . . . . . . . . . . . . . . . . . . . . . . . .243
12.10.12 Year Register (YRR) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 243
12.10.13 Day-Of-Week Register (DOWR) . . . . . . . . . . . . . . . . . . . . 244
12.10.14 Chronograph Data Register (CHRR) . . . . . . . . . . . . . . . . . 244
12.2 Introduction
This section describes the real time clock (RTC) module. The RTC
provides real time clock and calendar functions with automatic leap year
adjustments. Other functions include alarm interrupt, periodic interrupts,
and a chronograph timer.
NOTE: This module is designed for a 32.768-kHz oscillator.
12.3 Features
Features of the RTC module include:
• 32.768kHz clock input with frequency compensation
• Counter registers for:
– Second
– Minute
– Hour
– Day
– Day-of-week
– Month
– Year
• Day counter with automatic month and leap year adjustment
• 1/100 seconds chronograph counter
• Seven periodic interrupts
• Alarm interrupt
Data Sheet
218
Real Time Clock (RTC)
MC68HC908LJ24/LK24 — Rev. 2.1
Freescale Semiconductor