MEC1322 Datasheet, PDF (231/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
19.0 RTC WITH DATE AND DST ADJUSTMENT
19.1 Introduction
This block provides the capabilities of an industry-standard 146818B Real-Time Clock module, without CMOS RAM.
Enhancements to this architecture include:
• Industry standard Day of Month Alarm field, allowing for monthly alarms
• Configurable, automatic Daylight Savings adjustment
• Week Alarm for periodic interrupts and wakes based on Day of Week
• System Wake capability on interrupts.
19.2 References
1. Motorola 146818B Data Sheet, available on-line
2. Intel Lynx Point PCH EDS specification
19.3 Terminology
Time and Date Registers:
This is the set of registers that are automatically counted by hardware every 1 second while the block is enabled to run
and to update. These registers are: Seconds, Minutes, Hours, Day of Week, Day of Month, Month, and Year.
19.4 Interface
This block’s connections are entirely internal to the chip.
FIGURE 19-1:
I/O DIAGRAM OF BLOCK
Host Interface
RTC With Date and DST Adjust-
ment
Clocks
Resets
Interrupts
Signal Description
 2014 - 2015 Microchip Technology Inc.
DS00001719D-page 231