Irq Generation Waveform; Timer Interrupts - Texas Instruments OMAP5910 Technical Reference Manual

Real-Time Clock
7.13.2.6 Interrupts Management
7.13.2.7 Timer Interrupt
Table 7–124. Timer Interrupts
Figure 7–62. IRQ Generation Waveform
CLK_32KHZ
32766
Timer counter
Busy
NIRQ_TIMER
7-174
RTC can generate two interrupts:
-
Timer interrupt (IRQ_TIMER)
-
Alarm interrupt (IRQ_ALARM_CHIP)
IRQ_TIMER interrupt can be generated periodically every second, every
minute, every hour, or every day (RTC_INTERRUPTS_REG[1:0]).
The IT_TIMER bit of the interrupt register enables this interrupt.
The timer interrupt is a negative-edge-sensitive interrupt (low-level pulse
duration = 15 µs).
RTC_STATUS_REG [5:2] are only updated at each new interrupt and show
what events have happened, as shown in Table 7–124.
RTC_INTERRUPTS_REG[1:0]
RTC_STATUS_REG[5] (day)
RTC_STATUS_REG[4] (hour)
RTC_STATUS_REG[3] (min)
RTC_STATUS_REG[2] (sec)
† 1 when this event is concurrent to programmed periodical period
Figure 7–62 shows IRQ generation waveform.
32767
11 10
1 0/1
1 1
1 1
1 1
0 1
01 00
† † †
0/1 0/1
† †
0/1 0/1
†
1 0/1
1 1
2