MEC1322 Datasheet, PDF (241/456 Pages) Microchip Technology – Keyboard and Embedded Controller for Notebook PC

MEC1322
19.11.16 WEEK ALARM REGISTER
Offset ^14h
Bits
Description
7:0 ALARM_DAY_OF_WEEK
This register, if written to a value in the range 1--7, will inhibit the
Alarm interrupt unless this field matches the contents of the Day of
Week Register also. If this field is written to any value 11xxxxxxb (like
the default FFh), it represents a don’t-care, allowing more frequent
alarms, and will read back as FFh until another value is written.
Type
R/W
Default
FFh
Reset
Event
RTC_R
ST
19.11.17 DAYLIGHT SAVINGS FORWARD REGISTER
Offset ^18h
Bits
Description
Type
31 DST_FORWARD_AM_PM
R/W
This bit selects AM vs. PM, to match bit[7] of the Hours Register if 12-
Hour mode is selected in Register B at the time of writing.
30:24 DST_FORWARD_HOUR
R/W
This field holds the matching value for bits[6:0] of the Hours register.
The written value will be interpreted according to the 24/12 Hour
mode and DM mode settings at the time of writing.
23:19 Reserved
R
18:16 DST_FORWARD_WEEK
R/W
This value matches an internally-maintained week number within the
current month. Valid values for this field are:
5=Last week of month
4 =Fourth week of month
3=Third week of month
2=Second week of month
1=First week of month
15:11 Reserved
R
10:8 DST_FORWARD_DAY_OF_WEEK
R/W
This field matches the Day of Week Register bits[2:0].
7:0 DST_FORWARD_MONTH
R/W
This field matches the Month Register.
Default
0b
Reset
Event
RTC_R
ST
00h
RTC_R
ST
-
-
0h
RTC_R
ST
-
-
0h
RTC_R
ST
00h
RTC_R
ST
This is a 32-bit register, accessible also as individual bytes. When writing as individual bytes, ensure that the DSE bit
(in Register B) is off first, or that the block is disabled or stopped (SET bit), to prevent a time update while this register
may have incompletely-updated contents.
When enabled by the DSE bit in Register B, this register defines an hour and day of the year at which the Hours register
will be automatically incremented by 1 additional hour.
There are no don’t-care fields recognized. All fields must be already initialized to valid settings whenever the DSE bit is
‘1’.
Fields other than Week and Day of Week use the current setting of the DM bit (binary vs. BCD) to interpret the informa-
tion as it is written to them. Their values, as held internally, are not changed by later changes to the DM bit, without
subsequently writing to this register as well.
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DS00001719D-page 241