MEC1322 Datasheet, PDF (233/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
TABLE 19-5:
EC INTERRUPTS
Source
RTC
RTC ALARM
Description
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
This wake interrupt is signaled to the Interrupt Aggregator when an Alarm
event occurs.
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.
TABLE 19-6: RUNTIME REGISTER BASE ADDRESS TABLE
Block Instance
Instance
Number
Host
Address Space
Base Address
RTC
0
LPC
I/O
Programmed BAR
0
EC
32-bit internal
400F_2C00h
Address Space
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 19-7:
Offset
00h
01h
02h
03h
04h
05h
06h
07h
08h
RUNTIME REGISTER SUMMARY
Register Name (Mnemonic)
Seconds Register
Seconds Alarm Register
Minutes Register
Minutes Alarm Register
Hours Register
Hours Alarm Register
Day of Week Register
Day of Month Register
Month Register
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