MCP795W21 datasheet(22/54 Pages) MAS

22 / 54 page

MCP795WXX/MCP795BXX

DS22280A-page 22

Preliminary

 2011 Microchip Technology Inc.

HOURS 0X15

DAY 0X16

RWRWRW

12/24

10 Hour

AM/PM

10 Hour

Hour

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

Unimplemented

bit 6

12/24

bit 5

10 Hour AM/PM

bit 4

10 Hour

bit 3-0

Hour

ALM1PIN

ALM1C2

ALM1C1

ALM1C0

ALM1IF

Day

bit 7

bit 6

bit 5

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 – Hundredths/Tenth of Seconds

110 – Unimplemented do not use

111 – Seconds, Minutes, Hour, Day and Date

bit 3

Bit 3 is the ALM1IF bit. This is set by hardware when an alarm condition has be generated. The bit must

be cleared in software.

bit 2-0

Day

MCP795W21 Datasheet(PDF) 22 Page - Micro Analog systems

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