Interrupts
18-10 ADSP-214xx SHARC Processor Hardware Reference
In order to perform calibration on the bench, use the
RTCXTALIN pin and
check the ppm deviation from 32.768 KHz. This ppm error is same as in
the internal 1Hz clock and the calibration register should be updated with
the corresponding values as explained above.
Interrupts
The RTC has one interrupt that is programmable through the program-
mable interrupt priority control register (see Appendix B, Peripheral
Interrupt Control). The RTCI source bit is used to connect the RTC
interrupt to the peripheral interrupt inputs of the core. Table 18-2 pro-
vides and overview of RTC interrupts.
Service Interrupt Sources
One interrupt is shared by all the RTC interrupt sources. The sources are
based on the RTC counter:
• Per second
• Per minute
• Per hour
• Per day
Table 18-2. RTC Interrupt Overview
Interrupt Source Interrupt
Condition
Interrupt
Completion
Interrupt Acknowledge Default IVT
RTC Counter –Second, minute,
hour, day
–daily alarm
–underflow/stop-
watch expiry
Read to clear
RTC_STAT +
RTI instruction
Need to route
RTCI (PICRx)
to any PxxI
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