30.3.4 Time alarm
The Time Alarm register (TAR), SR[TAF], and IER[TAIE] allow the RTC to generate an
interrupt at a predefined time. The 32-bit TAR is compared with the 32-bit Time Seconds
register (TSR) each time it increments. SR[TAF] will set when TAR equals TSR and
TSR increments.
SR[TAF] is cleared by writing TAR. This will usually be the next alarm value, although
writing a value that is less than TSR, such as 0, will prevent SR[TAF] from setting again.
SR[TAF] cannot otherwise be disabled, although the interrupt it generates is enabled or
disabled by IER[TAIE].
30.3.5 Update mode
The Update Mode field in the Control register (CR[UM]) configures software write
access to the Time Counter Enable (SR[TCE]) field. When CR[UM] is clear, SR[TCE]
can be written only when LR[SRL] is set. When CR[UM] is set, SR[TCE] can also be
written when SR[TCE] is clear or when SR[TIF] or SR[TOF] are set. This allows the
time seconds and prescaler registers to be initialized whenever time is invalidated, while
preventing the time seconds and prescaler registers from being changed on the fly. When
LR[SRL] is set, CR[UM] has no effect on SR[TCE].
30.3.6 Register lock
The Lock register (LR) can be used to block write accesses to certain registers until the
next POR or software reset. Locking the Control register (CR) will disable the software
reset. Locking LR will block future updates to LR.
Write accesses to a locked register are ignored and do not generate a bus error.
30.3.7 Interrupt
The RTC interrupt is asserted whenever a status flag and the corresponding interrupt
enable bit are both set. It is always asserted on POR, and software reset. The RTC
interrupt is enabled at the chip level by enabling the chip-specific RTC clock gate control
bit. The RTC interrupt can be used to wakeup the chip from any low-power mode.
Chapter 30 Real Time Clock (RTC)
MKW01Z128 MCU Reference Manual, Rev. 3, 04/2016
Freescale Semiconductor, Inc.
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