3.8.4.1 RTC Instantiation Information
RTC prescaler is clocked by ERCLK32K.
RTC is reset on POR Only.
RTC_CR[OSCE] can override the configuration of the System OSC, configuring the
OSC for 32kHz crystal operation in all power modes (except VLLS0) and through any
System Reset. When OSCE is enabled, the RTC also overrides the capacitor
configurations.
3.8.4.2 RTC_CLKOUT options
RTC_CLKOUT pin can be driven either with the RTC 1 Hz output or with the
OSCERCLK on-chip clock source. Control for this option is through
SIM_SOPT2[RTCCLKOUTSEL] bit.
When RTCCLKOUTSEL=0, the RTC 1 Hz clock is output is selected on the
RTC_CLKOUT pin. When RTCCLKOUTSEL=1, OSCERCLK clock is output on the
RTC_CLKOUT pin.
Communication interfaces
3.9.1 Universal Serial Bus (USB) FS Subsystem
The USB FS subsystem includes these components:
• Dual-role USB OTG-capable (On-The-Go) controller that supports a full-speed (FS)
device or FS/LS host. The module complies with the USB 2.0 specification.
• USB transceiver that includes internal 15 kΩ pulldowns on the D+ and D- lines for
host mode functionality.
• A 3.3 V regulator.
• VBUS detect signal: To detect a valid VBUS in device mode, use a GPIO signal that
can wake the chip in all power modes.
3.9
Chapter 3 Chip Configuration
KL25 Sub-Family Reference Manual, Rev. 3, September 2012
Freescale Semiconductor, Inc. 91
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