Table 6.11.5-2 12/24 Hour Time Scale Selection - Nuvoton ISD94124BYI Technical Reference Manual

Isd arm cortex-m4f soc

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6.11.5.4 Time and Calendar counter

RTC_TIME and RTC_CAL are used to load the real time and calendar. RTC_TALM and

RTC_CALM are used for setup alarm time and calendar.

6.11.5.5 12/24 hour Time Scale Selection

The 12/24 hour time scale selection depends on 24HEN (RTC_CLKFMT[0]).

When RTC runs as 12-hour time scale mode, RTC_TIME[21] (the high bit of TENHR[1:0]) means

AM/PM indication, if RTC_TIME[21] is 1, it indicates PM time message and RTC_TIME[21] is 0

indicates AM time message. Table 6.11.5-2 shows RTC_TIME mapping table of 12/24 hour time

scale selection.

Note: The Hour Value Write Into RTC_TIME[21:16], Messages Are Expressed In BCD Format.

24-Hour Time Scale

6.11.5.6 Day of the Week Counter

The RTC controller provides day of week in WEEKDAY bits (RTC_WEEKDAY[2:0]). The value is

defined from 0 to 6 to represent Sunday to Saturday respectively.

6.11.5.7 Periodic Time Tick Interrupt

The periodic time tick interrupt has 8 period interval options 1/128, 1/64, 1/32, 1/16, 1/8, 1/4, 1/2

and 1 second that are selected by TICK bits (RTC_TICK[2:0]). When periodic time tick interrupt is

enabled by setting TICKIEN (RTC_INTEN[1]) to 1, the periodic time tick interrupt is requested

periodically in the period selected by RTC_TICK[2:0] settings.

6.11.5.8 Alarm Interrupt

When the real time and calendar message in RTC_TIME and RTC_CAL registers are equal to

alarm time and calendar values in RTC_TALM and RTC_CALM registers, the RTC alarm interrupt

flag ALMIF (RTC_INTSTS[0]) is set to 1 and the RTC alarm interrupt signal assert if the alarm

interrupt enable ALMIEN (RTC_INTEN[0]) is enabled.

ISD94100 Series Technical Reference Manual

Table 6.11.5-2 12/24 hour Time Scale Selection

Page 547 of 928

12-Hour Time Scale (PM Time + 20)

(24HEN = 0) (PM Time + 20)

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