MCP795W21 datasheet(19/54 Pages) MAS

19 / 54 page

 2011 Microchip Technology Inc.

Preliminary

DS22280A-page 19

MCP795WXX/MCP795BXX

DAY 0X0F

DATE 0X10

ALM0PIN

ALM0C2

ALM0C1

ALM0C0

ALM0IF

Day

bit 7

bit6

bit 4

bit 3

bit 2

bit 0

Legend: R = Readable Bit W = Writable Bit U = Unimplemented bit, Read as ‘0’

bit 7

Bit 7 configures the pin that is used for the Alarm 0 output. If this bit is clear the IRQ pin is used. If set, the

WDO pin is used. If the WDT is enabled then a valid Alarm will assert the WDO pin for 122 us.

BIT 6:4

Bits <6:4> sets the condition on what the Alarm will trigger. The following options are available:

000 – Seconds match

001 – Minutes match

010 – Hours match (logic takes into account 12/24 operation)

011 – Day match. Generates interrupt at 12:00:00 AM

100 – Date match

101 – Unimplemented, do not use

110 – Unimplemented, do not use

111 – Seconds, Minutes, Hour, Day, Date and Month

bit 3

Bit 3 is the ALM0IF bit. This is set by hardware when an alarm condition has be generated. The bit must

be cleared in software.

bit 2-0

Day

10 Date

Date

bit 7

bit 6

bit 5

bit 4

bit 3

bit 0

Legend: R = Readable Bit W = Writable Bit U = Unimplemented bit, Read as ‘0’

bit 7-6

Unimplemented

bit 5-4

10 Date

bit 3-0

Date

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