MEC1322 datasheet(242/456 Pages) MICROCHIP

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MEC1322

DS00001719D-page 242

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19.11.18 DAYLIGHT SAVINGS BACKWARD 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

increment will be inhibited from occurring. After triggering, this feature is automatically disabled for long enough to

ensure that it will not retrigger the second time this Hours value appears, and then this feature is re-enabled automati-

cally.

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.

Note:

An Alarm that is set inside the hour after the time specified in this register will not be triggered, because

that one-hour period is skipped. This period includes the exact time (0 minutes: 0 seconds) given by this

Offset

1Ch

Bits

Description

Type

Default

Reset

Event

31 DST_BACKWARD_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_BACKWARD_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_BACKWARD_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_BACKWARD_DAY_OF_WEEK

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

R/W

RTC_R

7:0 DST_BACKWARD_MONTH

This field matches the Month Register.

R/W

00h

RTC_R

Note:

An Alarm that is set inside the hour before the time specified in this register will be triggered twice, because

that one-hour period is repeated. This period will include the exact time (0 minutes: 0 seconds) given by

this register, through the 59 minutes: 59 seconds point afterward.

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