R01UH0823EJ0100 Rev.1.00
Page 803 of 1823
Jul 31, 2019
RX23W Group
28. Realtime Clock (RTCe)
28.5
Event Link Output
The RTC outputs the following event signals for the event link controller (ELC), and these can be used to initiate
operations by other modules selected in advance.
(1) Periodic event output
The periodic event signal is output at the interval selected from among 1/256, 1/128, 1/64, 1/32, 1/16, 1/8, 1/4, 1/2, 1, and
2 seconds by the setting of the RCR1.PES[3:0] bits.
The event generation period immediately after the event generation is selected is not guaranteed.
Note:
If event linking from the RTC is to be used, only make the ELC settings after making the RTC settings
(initialization, time settings, etc.). Making the RTC settings after the ELC settings can lead to the output of
unexpected event signals.
28.5.1
Interrupt Handling and Event Linking
The RTC has a bit to enable or disable periodic interrupts. An interrupt request signal is output for the CPU when an
interrupt source is generated while the corresponding enable bit is enabled.
In contrast, an event link output signal is sent to other modules as an event signal via the ELC when an interrupt source is
generated, regardless of the setting of the corresponding interrupt enable bit.
Note:
Although alarm and periodic interrupts can still be output during software standby, the periodic event signals for
the ELC are not output.