Chapter 34
Real Time Clock (RTC)
34.1 Introduction
NOTE
For the chip-specific implementation details of this module's
instances see the chip configuration information.
34.1.1 Features
The RTC module features include:
• 32-bit seconds counter with roll-over protection and 32-bit alarm
• 16-bit prescaler with compensation that can correct errors between 0.12 ppm and
3906 ppm
• Register write protection
• Lock register requires POR or software reset to enable write access
• 1 Hz square wave output
34.1.2 Modes of operation
The RTC remains functional in all low power modes and can generate an interrupt to exit
any low power mode.
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 597
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