Information

Section Number Title Page
Chapter 39
Real Time Clock (RTC)
39.1 Introduction...................................................................................................................................................................863
39.1.1 Features........................................................................................................................................................863
39.1.2 Modes of operation......................................................................................................................................863
39.1.3 RTC signal descriptions...............................................................................................................................864
39.2 Register definition.........................................................................................................................................................864
39.2.1 RTC Time Seconds Register (RTC_TSR)...................................................................................................865
39.2.2 RTC Time Prescaler Register (RTC_TPR)..................................................................................................866
39.2.3 RTC Time Alarm Register (RTC_TAR).....................................................................................................866
39.2.4 RTC Time Compensation Register (RTC_TCR).........................................................................................867
39.2.5 RTC Control Register (RTC_CR)................................................................................................................868
39.2.6 RTC Status Register (RTC_SR)..................................................................................................................869
39.2.7 RTC Lock Register (RTC_LR)....................................................................................................................870
39.2.8 RTC Interrupt Enable Register (RTC_IER).................................................................................................872
39.2.9 RTC Write Access Register (RTC_WAR)..................................................................................................873
39.2.10 RTC Read Access Register (RTC_RAR)....................................................................................................874
39.3 Functional description...................................................................................................................................................875
39.3.1 Power, clocking and reset............................................................................................................................875
39.3.2 Time counter................................................................................................................................................877
39.3.3 Compensation...............................................................................................................................................877
39.3.4 Time alarm...................................................................................................................................................878
39.3.5 Update mode................................................................................................................................................878
39.3.6 Register lock................................................................................................................................................878
39.3.7 Access control..............................................................................................................................................879
39.3.8 Interrupt........................................................................................................................................................879
K20 Sub-Family Reference Manual, Rev. 2, Feb 2012
32 Freescale Semiconductor, Inc.