M41TC8025AMC5F datasheet(16/41 Pages) STMICROELECTRONICS

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Operation

M41TC8025

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DocID022873 Rev 4

Note:

Do not write more than one bit of "1" in the Day-of-week register.

Note:

Writing invalid day-of-week data may interfere with normal operation of the calendar.

The data in the date (day of month), month and year registers are in BCD format. For

example, the date register value "0011 0001" indicates 31st.

The date counter counts from "01" to "02", "03" and up to "31" and rolls over to "01" after

that. The maximum date value varies according to the value in the month register which is

show in Table 8.

Note:

Leap year is whenever the year value is a multiple of four (such as 04, 08, 12…88, 92, or

96). Year 00 is not considered to be a leap year.

The month counter counts from "01" to "02", "03" and up to "12" and it rolls over to "01" after

that. It represents: January, February… and December.

The year counter counts from "00" to "01", "02" and up to "99" and it rolls over to "00" after

that. It may represent: year 2000, 2001… and 2099. Any year that is a multiple of four (04,

08, 12… 88, 92, 96, etc.) is automatically handled as a leap year. Year 00 is not considered

to be a leap year.

2.4.3

Clock reset function

Table 7. Data for day-of-week

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

Data [h]

Day-of-week

01h

Sunday

02h

Monday

04h

Tuesday

08h

Wednesday

10h

Thursday

20h

Friday

40h

Saturday

Table 8. Data for date (day of month) register

Month value

Data for date (day of month) register

1, 3, 5, 7, 8, 10 or 12

02…310102…

4, 6, 9 or 11

02…300102…

February in normal year

02…280102…

February in leap year

02…290102…

Table 9. Reset bit in control register 0Fh

Address

Function

Bit 7

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

0Fh

Control register CSEL1 CSEL0

UIE

TIE

AIE

RESET

Obsolete

Product(s)

- Obsolete

Product(s)

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