Freescale Semiconductor MK22FN256VDC12, Reference Manual

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3.8.5 RTC configuration
This section summarizes how the module has been configured in the chip. For a
comprehensive description of the module itself, see the module’s dedicated chapter.
Signal
multiplexing
Register
access
Peripheral
bridge
Module signals
Real-time clock
Figure 3-42. RTC configuration
Table 3-58. Reference links to related information
Topic Related module Reference
Full description RTC RTC
System memory map System memory map
Clocking Clock Distribution
Power management Power management
3.8.5.1 RTC_CLKOUT signal
When the RTC is enabled and the port control module selects the RTC_CLKOUT
function, the RTC_CLKOUT signal outputs a 1 Hz or 32 kHz output derived from RTC
oscillator as shown below.
SIM_SOPT2[RTCCLKOUTSEL]
RTC_CLKOUT
RTC 1Hz clock
RTC 32kHz clock
RTC_CR[CLKO]
Figure 3-43. RTC_CLKOUT generation
Chapter 3 Chip Configuration
K22F Sub-Family Reference Manual , Rev. 3, 7/2014
Freescale Semiconductor, Inc. 117