MEC1322 datasheet(233/456 Pages) MICROCHIP

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DS00001719D-page 233

MEC1322

19.9

Low Power Modes

The RTC has no low-power modes. It runs continuously while the VBAT well is powered.

19.10 Description

This block provides the capabilities of an industry-standard 146818B Real-Time Clock module, excluding the CMOS

RAM and the SQW output. See the following registers, which represent enhancements to this architecture. These

enhancements are listed below.

See the Date Alarm field of Register D for a Day of Month qualifier for alarms.

See the Week Alarm Register for a Day of Week qualifier for alarms.

See the registers Daylight Savings Forward Register and Daylight Savings Backward Register for setting up hands-off

Daylight Savings adjustments.

See the RTC Control Register for enhanced control over the block’s operations.

19.11 Runtime Registers

The addresses of each register listed in this table are defined as a relative offset to the host “Base Address” defined in

Runtime Register Base Address Table.

The Base Address indicates where the first register can be accessed in a particular address space for a block instance.

Add the register’s Offset to this value to obtain the direct address of the register.

TABLE 19-5:

EC INTERRUPTS

Source

Description

RTC

This interrupt is signaled to the Interrupt Aggregator when any of the fol-

lowing events occur:

• Update complete. This is triggered, at 1-second intervals, when the

Time register updates have completed

• Alarm. This is triggered when the alarm value matches the current

time (and date, if used)

• Periodic. This is triggered at the chosen programmable rate

RTC ALARM

This wake interrupt is signaled to the Interrupt Aggregator when an Alarm

event occurs.

TABLE 19-6:

RUNTIME REGISTER BASE ADDRESS TABLE

Block Instance

Instance

Number

Host

Address Space

Base Address

RTC

LPC

I/O

Programmed BAR

32-bit internal

Address Space

400F_2C00h

TABLE 19-7:

RUNTIME REGISTER SUMMARY

Offset

00h

Seconds Register

01h

Seconds Alarm Register

02h

Minutes Register

03h

Minutes Alarm Register

04h

Hours Register

05h

Hours Alarm Register

06h

Day of Week Register

07h

Day of Month Register

08h

Month Register

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