Atmel SAM4S-XPLD Atmel ATSAM4S-XPLD ATSAM4S-XPLD Datenbogen

 259

SAM4S [DATASHEET]

11100E–ATARM–24-Jul-13

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 or Persian calendar, 
complemented by a 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.

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.

A clock divider calibration circuitry enables to compensate crystal oscillator frequency inaccuracy.

An RTC output can be programmed to generate several waveforms, including a prescaled clock derived from 32.768 kHz



Ultra Low Power Consumption



Full Asynchronous Design



Gregorian Calendar up to 2099 or Persian Calendar



Programmable Periodic Interrupt



Safety/security features:



Valid Time and Date Programmation Check



On-The-Fly Time and Date Validity Check



Crystal Oscillator Clock Calibration



Waveform Generation