SAM3X8E Atmel Corporation, SAM3X8E Datasheet - Page 245

• Manufacturer Part Number: SAM3X8E
• Manufacturer: Atmel Corporation

15. Real-time Clock (RTC)
15.1
15.2
15.3
Figure 15-1. RTC Block Diagram
15.4
15.4.1
15.4.2
11057A–ATARM–17-Feb-12
11057A–ATARM–17-Feb-12
Description
Embedded Characteristics
Block Diagram
Product Dependencies
Power Management
Interrupt
Slow Clock: SLCK
Bus Interface
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 calen-
dar, 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.
The Real-time Clock is continuously clocked at 32768 Hz. The Power Management Controller
has no effect on RTC behavior.
RTC interrupt line is connected on one of the internal sources of the interrupt controller. RTC
interrupt requires the interrupt controller to be programmed first.
• Low Power Consumption
• Full Asynchronous Design
• Two Hundred Year Gregorian Calendar
• Programmable Periodic Interrupt
• Time, Date and Alarm 32-bit Parallel Load
• Write Protected Registers
32768 Divider
Bus Interface
Control
Entry
Time
Interrupt
Control
Date
RTC Interrupt
SAM3X/A
SAM3X/A
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