32-bit real-time cou" />
參數(shù)資料
115
32015G–AVR32–09/09
AT32AP7001
12. Real Time Counter (RTC)
Rev: 1.0.1.1
12.1
Features
32-bit real-time counter with 16-bit prescaler
Clocked from 32 kHz oscillator
High resolution: Max count frequency 16KHz
Long delays
– Max timeout 272 years
Extremely low power consumption
Available in all sleep modes except Deepdown
Optional wrap at max value
Interrupt on wrap
12.2
Description
The Real Time Counter (RTC) enables periodic interrupts at long intervals, or accurate mea-
surement of real-time sequences. The RTC is fed from a 16-bit prescaler, which is clocked from
the 32 kHz oscillator. Any tapping of the prescaler can be selected as clock source for the RTC,
enabling both high resolution and long timeouts. The prescaler cannot be written directly, but
can be cleared by the user.
The RTC can generate an interrupt when the counter wraps around the top value of
0xFFFFFFFF. Optionally, the RTC can wrap at a lower value, producing accurate periodic
interrupts.
12.3
Block Diagram
Figure 12-1. Real Time Counter module block diagram
12.4
Product Dependencies
12.4.1
I/O Lines
None.
16-bit Prescaler
32 KHz
32-bit counter
RTC_VAL
RTC_TOP
TOPI
IRQ
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