MCP79520 datasheet(22/58 Pages) MICROCHIP

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MCP7951X/MCP7952X

DS20002300D-page 22

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5.4

Alarms

The MCP795XX features two independent alarms.

Each alarm can be used to either generate an interrupt

at a specific time in the future, or to generate a periodic

interrupt every second (Alarm 1 only), minute, hour,

day, day of week, or month.

There is a separate interrupt flag, ALMxIF, for each

alarm. The interrupt flags are set by hardware when the

chosen alarm mask condition matches (Table 5-5 and

Table 5-6). The interrupt flags must be cleared in

software.

For alarm outputs to function, the Square Wave Output

function must be disabled. Each of the two independent

alarm signals are assigned to the MFP pin where either

can pull it low. The pin will stay low until both the alarm

flags are cleared. The alarm output to the MFP pin is

available while operating from the backup supply.

All time and date values are stored in the registers as

binary-coded decimal (BCD) values.

TABLE 5-5:

ALARM 0 MASKS

TABLE 5-6:

ALARM 1 MASKS

Note:

Throughout this section, references to the

modules are referred to generically by the

use of ‘x’ in place of the specific module

number. Thus, “ALMxSEC” might refer to

the seconds register for Alarm 0 or

Alarm 1.

ALM0MSK<2:0>

Alarm 0 Asserts on Match of

000

Seconds

001

Minutes

010

Hours

011

Day of Week

100

Date

101

Reserved

110

Reserved

111

Seconds, Minutes, Hours, Day of

Week, Date, and Month

ALM1MSK<2:0>

Alarm 1 Asserts on Match of

000

Seconds

001

Minutes

010

Hours

011

Day of Week

100

Date

101

Hundredth of Seconds

110

Reserved

111

Seconds, Minutes, Hours, Day of

Week and Date

Note 1: The alarm interrupt flags must be cleared

by the user.

2: Loading invalid values into the alarm

registers

will

result

undefined

operation.

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