Datasheet

MCP7940N
DS20005010F-page 12  2010-2014 Microchip Technology Inc.
TABLE 5-1: DETAILED RTCC REGISTER MAP
Addr. Register Name Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Section 5.3 “Timekeeping”
00h RTCSEC ST SECTEN2 SECTEN1 SECTEN0 SECONE3 SECONE2 SECONE1 SECONE0
01h RTCMIN
— MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0
02h RTCHOUR
—12/24 AM/PM
HRTEN1
HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0
03h RTCWKDAY
— — OSCRUN PWRFAIL VBATEN WKDAY2 WKDAY1 WKDAY0
04h RTCDATE
— — DATETEN1 DATETEN0 DATEONE3 DATEONE2 DATEONE1 DATEONE0
05h RTCMTH
— — LPYR MTHTEN0 MTHONE3 MTHONE2 MTHONE1 MTHONE0
06h RTCYEAR YRTEN3 YRTEN2 YRTEN1 YRTEN0 YRONE3 YRONE2 YRONE1 YRONE0
07h CONTROL OUT SQWEN ALM1EN ALM0EN EXTOSC CRSTRIM SQWFS1 SQWFS0
08h OSCTRIM SIGN TRIMVAL6 TRIMVAL5 TRIMVAL4 TRIMVAL3 TRIMVAL2 TRIMVAL1 TRIMVAL0
09h Reserved Reserved – Do not use
Section 5.4 “Alarms”
0Ah ALM0SEC — SECTEN2 SECTEN1 SECTEN0 SECONE3 SECONE2 SECONE1 SECONE0
0Bh ALM0MIN
— MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0
0Ch ALM0HOUR
— 12/24
(2)
AM/PM
HRTEN1
HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0
0Dh ALM0WKDAY ALMPOL ALM0MSK2 ALM0MSK1 ALM0MSK0 ALM0IF WKDAY2 WKDAY1 WKDAY0
0Eh ALM0DATE
— — DATETEN1 DATETEN0 DATEONE3 DATEONE2 DATEONE1 DATEONE0
0Fh ALM0MTH
— — — MTHTEN0 MTHONE3 MTHONE2 MTHONE1 MTHONE0
10h Reserved Reserved – Do not use
Section 5.4 “Alarms”
11h ALM1SEC — SECTEN2 SECTEN1 SECTEN0 SECONE3 SECONE2 SECONE1 SECONE0
12h ALM1MIN
— MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0
13h ALM1HOUR
— 12/24
(2)
AM/PM
HRTEN1
HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0
14h ALM1WKDAY ALMPOL
(3)
ALM1MSK2 ALM1MSK1 ALM1MSK0 ALM1IF WKDAY2 WKDAY1 WKDAY0
15h ALM1DATE
— — DATETEN1 DATETEN0 DATEONE3 DATEONE2 DATEONE1 DATEONE0
16h ALM1MTH
— — — MTHTEN0 MTHONE3 MTHONE2 MTHONE1 MTHONE0
17h Reserved Reserved – Do not use
Section 5.7.1 “Power-Fail Time-Stamp”
18h PWRDNMIN — MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0
19h PWRDNHOUR
—12/24 AM/PM
HRTEN1
HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0
1Ah PWRDNDATE
— — DATETEN1 DATETEN0 DATEONE3 DATEONE2 DATEONE1 DATEONE0
1Bh PWRDNMTH WKDAY2 WKDAY1 WKDAY0 MTHTEN0 MTHONE3 MTHONE2 MTHONE1 MTHONE0
Section 5.7.1 “Power-Fail Time-Stamp”
1Ch PWRUPMIN — MINTEN2 MINTEN1 MINTEN0 MINONE3 MINONE2 MINONE1 MINONE0
1Dh PWRUPHOUR
—12/24 AM/PM
HRTEN1
HRTEN0 HRONE3 HRONE2 HRONE1 HRONE0
1Eh PWRUPDATE
— — DATETEN1 DATETEN0 DATEONE3 DATEONE2 DATEONE1 DATEONE0
1Fh PWRUPMTH WKDAY2 WKDAY1 WKDAY0 MTHTEN0 MTHONE3 MTHONE2 MTHONE1 MTHONE0
Note 1: Grey areas are unimplemented.
2: The 12/24
bits in the ALMxHOUR registers are read-only and reflect the value of the 12/24 bit in the
RTCHOUR register.
3: The ALMPOL bit in the ALM1WKDAY register is read-only and reflects the value of the ALMPOL bit in the
ALM0WKDAY register.