Atmel ARM-Based Evaluation Kit AT91SAM9N12-EK AT91SAM9N12-EK Data Sheet
Product codes
AT91SAM9N12-EK
122
SAM9N12/SAM9CN11/SAM9CN12 [DATASHEET]
11063K–ATARM–05-Nov-13
15.
Real-time Clock (RTC)
15.1
Description
The Real-time Clock (RTC) peripheral is designed for very low power consumption.
It combines a complete time-of-day clock with alarm and a two-hundred-year Gregorian calendar, complemented by a
programmable periodic interrupt. The alarm and calendar registers are accessed by a 32-bit data bus.
programmable periodic interrupt. The alarm and calendar registers are accessed by a 32-bit data bus.
The time and calendar values are coded in binary-coded decimal (BCD) format. The time format can be 24-hour mode or
12-hour mode with an AM/PM indicator.
12-hour mode with an AM/PM indicator.
Updating time and calendar fields and configuring the alarm fields are performed by a parallel capture on the 32-bit data
bus. An entry control is performed to avoid loading registers with incompatible BCD format data or with an incompatible
date according to the current month/year/century.
bus. An entry control is performed to avoid loading registers with incompatible BCD format data or with an incompatible
date according to the current month/year/century.
15.2
Embedded Characteristics
Ultra Low-power Consumption
Full Asynchronous Design
Gregorian Calendar up to 2099
Programmable Periodic Interrupt
Safety/security features:
Valid Time and Date Programmation Check