M41TC8025CMC7F datasheet(27/41 Pages) STMICROELECTRONICS

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M41TC8025

Operation

Note:

x means don't care.

If all the AM_M, AM_H and AM_D bits in register 08h, 09h and 0Ah are set to 1, that means

all the day-of-month, hours and minutes registers do not compare and the alarm will be

generated every minute.

The alarm event only happens when the current clock and calendar counts match the alarm

condition. Even if the current date/time is set as the alarm condition, the alarm will not occur

until the counter counts up to the current date/time (i.e., an alarm will occur the next time,

not immediately).

2.8.3

Example operation of the alarm interrupt

The alarm interrupt example is given in Figure 16. The alarm interrupt timing sequence is

given in Figure 17.

Figure 16. Example of alarm interrupt operation

Note:

There is no auto-clear of the IRQ pin.

Table 21. Date alarm settings

Reg.

09h

Reg.

08h

Alarm description

Date (day-of-month) alarm

Hour

Minute

Bit 7

AM_D

Bit 6

Bit 5

Bit 4

Bit 3

Bit 2

Bit 1

Bit 0

S01

Date (day-

of-month)

is selected

(WADA=1)

1000

18h

80h~

FFh

The 8th of each month at

6:00 pm, the minute

value is not compared

1000

80h~

FFh

28h

The 18th of each month

at 28 minutes each hour,

the hour value is not

compared

18h

Every day at 6:18 pm

xxxx

80h~

FFh

80h~

FFh

Alarm at every minute

Obsolete

Product(s)

- Obsolete

Product(s)

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