Functional Description
18-4 ADSP-214xx SHARC Processor Hardware Reference
Initialization Status Register (RTC_INITSTAT). Used to report initial-
ization events.
Functional Description
The primary function of the RTC is to maintain an accurate day count
and time of day. The RTC accomplishes this by means of four counters:
• 60-second counter
• 60-minute counter
• 24-hour counter
• 32768-day counter
The RTC increments the 60-second counter once per second and incre-
ments the other three counters when appropriate. The 32768-day counter
is incremented each day at midnight (23 hours, 59 minutes, 59 seconds).
Interrupts can be issued periodically, either every second, every minute,
every hour, or every day. Each of these interrupts can be independently
controlled. The RTC block diagram is shown in Figure 18-1.
Power-up and Reset
A programmable register bit is provided to power-down the RTC. Here
power-down is interpreted as a crystal oscillator disable, which would
reduce power dissipation to only leakage current. Once set or reset, this
bit retains its value unless changed, irrespective of the status of core
supply.
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