Datasheet
2012-2018 Microchip Technology Inc. DS20002300C-page 34
MCP7951X/MCP7952X
TABLE 5-11: SUMMARY OF REGISTERS ASSOCIATED WITH BATTERY BACKUP
REGISTER 5-20: PWRxxDATE: POWER-DOWN/POWER-UP TIMESTAMP DATE VALUE REGISTER
(ADDRESSES 0x1A/0x1E)
U-0 U-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
— — 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
REGISTER 5-21: PWRxxMTH: POWER-DOWN/POWER-UP TIMESTAMP MONTH VALUE
REGISTER (ADDRESSES 0x1B/0x1F)
R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0 R/W-0
WKDAY2 WKDAY1 WKDAY0 MTHTEN0 MTHONE3 MTHONE2 MTHONE1 MTHONE0
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 7-5 WKDAY<2:0>: Binary-Coded Decimal Value of Day bits
Contains a value from 1 to 7. The representation is user-defined.
bit 4 MTHTEN0: Binary-Coded Decimal Value of Month’s Ones Digit
Contains a value of 0 or 1
bit 3-0 MTHONE<3:0>: Binary-Coded Decimal Value of Month’s Ones Digit
Contains a value from 0 to 9
Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Register
on Page
RTCWKDAY
— — OSCRUN PWRFAIL VBATEN WKDAY2 WKDAY1 WKDAY0
19
PWRDNMIN
— MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0
33
PWRDNHOUR
—12/24AM/PM
HRTEN1
HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0
33
PWRDNDATE
— — DATETEN1 DATETEN0 DATEONE3 DATEONE2 DATEONE1 DATEONE0
34
PWRDNMTH
WKDAY2 WKDAY1 WKDAY0 MTHTEN0 MTHONE3 MTHONE2 MTHONE1 MTHONE0
34
PWRUPMIN
— MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0
33
PWRUPHOUR
—12/24AM/PM
HRTEN1
HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0
33
PWRUPDATE
— — DATETEN1 DATETEN0 DATEONE3 DATEONE2 DATEONE1 DATEONE0
34
PWRUPMTH
WKDAY2 WKDAY1 WKDAY0 MTHTEN0 MTHONE3 MTHONE2 MTHONE1 MTHONE0
34
Legend: — = unimplemented location, read as ‘0’. Shaded cells are not used with battery backup.