PXN20RM Datasheet, PDF (160/1376 Pages) Freescale Semiconductor, Inc – PXN20 Microcontroller

Clocks, Reset, and Power (CRP)
RTCCNT
sync
APIVAL
APIF
APIIE
API Interrupt
CLKSEL
0 123
512
DIV512EN
 32
DIV32EN
9–0
APIEN
or
CNTEN
reset
9–0
+
sync
offset reg
load
==
API Wakeup
0
31
32-bit counter
reset
21–10
==
RTCVAL
sync
sync ROVREN
RTCF
ROVRF
RTCIE
ROVREN
ROVREN
Figure 6-20. RTC/API Block Diagram
RTC Wakeup
RTC Rollover Wakeup
RTC cnt_or_rlovr
RTC Interrupt
6.4.3 Register Description
The RTC registers control and monitor operation of the RTC. The registers that are relevant to the use of
the RTC are as follows.
• RTC status and control register (Section 6.2.2.2, RTC Control Register (CRP_RTCC))
• RTC counter register (Section 6.2.2.4, RTC Counter Register (CRP_RTCCNT))
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PXN20 Microcontroller Reference Manual, Rev. 1
Freescale Semiconductor