MCP7940N-ESLASHMS datasheet(23/58 Pages) MICROCHIP

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DS20005010J-page 23

MCP7940N

ALMxWKDAY: ALARM0/1 WEEKDAY VALUE REGISTER (ADDRESSES

0x0D/0x14)

R/W-0

R/W-1

ALMPOL

ALMxMSK2

ALMxMSK1 ALMxMSK0

ALMxIF

WKDAY2

WKDAY1

WKDAY0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is clear

x = Bit is unknown

bit 7

ALMPOL: Alarm Interrupt Output Polarity bit

1 = Asserted output state of MFP is a logic high level

0 = Asserted output state of MFP is a logic low level

bit 6-4

ALMxMSK<2:0>: Alarm Mask bits

000 = Seconds match

001 = Minutes match

010 = Hours match (logic takes into account 12-/24-hour operation)

011 = Day of week match

100 = Date match

101 = Reserved; do not use

110 = Reserved; do not use

111 = Seconds, Minutes, Hour, Day of Week, Date and Month

bit 3

ALMxIF: Alarm Interrupt Flag bit(1,2)

1 = Alarm match occurred (must be cleared in software)

0 = Alarm match did not occur

bit 2-0

WKDAY<2:0>: Binary-Coded Decimal Value of Day bits

Contains a value from 1 to 7. The representation is user-defined.

Note 1: If a match condition still exists when this bit is cleared, it will be set again automatically.

2: The ALMxIF bit cannot be written to a 1 in software. Writing to the ALMxWKDAY register will always clear

the ALMxIF bit.

ALMxDATE: ALARM0/1 DATE VALUE REGISTER (ADDRESSES 0x0E/0x15)

U-0

R/W-0

R/W-1

—

DATETEN1

DATETEN0 DATEONE3

DATEONE2

DATEONE1

DATEONE0

bit 7

bit 0

Legend:

R = Readable bit

W = Writable bit

U = Unimplemented bit, read as ‘0’

-n = Value at POR

‘1’ = Bit is set

‘0’ = Bit is clear

x = Bit is unknown

bit 7-6

Unimplemented: Read as ‘0’

bit 5-4

DATETEN<1:0>: Binary-Coded Decimal Value of Date’s Tens Digit

Contains a value from 0 to 3

bit 3-0

DATEONE<3:0>: Binary-Coded Decimal Value of Date’s Ones Digit

Contains a value from 0 to 9

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