MCP7940N-ESLASHMS datasheet(18/58 Pages) MICROCHIP

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MCP7940N

DS20005010J-page 18

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RTCWKDAY: TIMEKEEPING WEEKDAY VALUE REGISTER (ADDRESS 0x03)

U-0

R-0

R/W-0

R/W-1

—

OSCRUN

PWRFAIL

VBATEN

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 7-6

Unimplemented: Read as ‘0’

bit 5

OSCRUN: Oscillator Status bit

1 = Oscillator is enabled and running

0 = Oscillator has stopped or has been disabled

bit 4

PWRFAIL: Power Failure Status bit(1,2)

1 = Primary power was lost and the power-fail time-stamp registers have been loaded (must be

cleared in software). Clearing this bit resets the power-fail time-stamp registers to ‘0’.

0 = Primary power has not been lost

bit 3

VBATEN: External Battery Backup Supply (VBAT) Enable bit

1 = VBAT input is enabled

0 = VBAT input is disabled

bit 2-0

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

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

Note 1: The PWRFAIL bit must be cleared to log new time-stamp data. This is to ensure previous time-stamp data

is not lost.

2: The PWRFAIL bit cannot be written to a ‘1’ in software. Writing to the RTCWKDAY register will always

clear the PWRFAIL bit.

RTCDATE: TIMEKEEPING DATE VALUE REGISTER (ADDRESS 0x04)

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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