if (RTC_SR & RTC_SR_TAF_MASK)
{
// clear the TAF flag by writing the RTC_TAR register
RTC_TAR = 0;
}
// Then doing the alarm task in this IRQ Handler
………
43.5.3 RTC_CLKOUT signal
When the RTC is enabled and the port control module selects the RTC_CLKOUT
function, the RTC_CLKOUT signal output either a square wave prescaler output
(configurable to 1, 2, 4, 8, 16, 32, 64 or 128 Hz) or 32 kHz output derived from RTC
oscillator as shown below.
RTC_CR[CPS]
RTC_CLKOUT
RTC 1/2/4/8/16/32/64/128 Hz clock
(configurable via RTC_IER[TSIC])
RTC 32 kHz clock
RTC_CR[CLKO]
Figure 43-1. RTC_CLKOUT generation
NOTE
When using LPO 1kHz as RTC clock source, it cannot directly
output to pad. But RTC can normally output 1/2/4/8/…/64/128
Hz clock using prescaler.
Usage Guide
Kinetis KE1xZ256 Sub-Family Reference Manual, Rev. 3, 07/2018
1088
NXP Semiconductors
Summary of Contents for Kinetis KE1xZ256
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