MEC1322 datasheet(241/456 Pages) MICROCHIP

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DS00001719D-page 241

MEC1322

19.11.16 WEEK ALARM REGISTER

19.11.17 DAYLIGHT SAVINGS FORWARD REGISTER

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.

Offset

14h

Bits

Description

Type

Default

Reset

Event

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.

R/W

FFh

RTC_R

Offset

18h

Bits

Description

Type

Default

Reset

Event

31 DST_FORWARD_AM_PM

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.

R/W

RTC_R

30:24 DST_FORWARD_HOUR

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.

R/W

00h

RTC_R

23:19 Reserved

18:16 DST_FORWARD_WEEK

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

R/W

RTC_R

15:11 Reserved

10:8 DST_FORWARD_DAY_OF_WEEK

This field matches the Day of Week Register bits[2:0].

R/W

RTC_R

7:0 DST_FORWARD_MONTH

This field matches the Month Register.

R/W

00h

RTC_R

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