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參數(shù)資料
| 型號(hào)： | M41T94MQ6TR |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO16 |
| 封裝： | PLASTIC, SOIC-16 |
| 文件頁數(shù)： | 13/40頁 |
| 文件大?。?/td> | 328K |
| 代理商： | M41T94MQ6TR |
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Clock operations
M41T94
4.3
Setting Alarm clock registers
Address locations 0Ah-0Eh contain the Alarm settings. The Alarm can be configured to go
off at a prescribed time on a specific month, date, hour, minute, or second, or repeat every
year, month, day, hour, minute, or second. It can also be programmed to go off while the
M41T94 is in the battery back-up to serve as a system wake-up call.
Bits RPT5-RPT1 put the Alarm in the Repeat mode of operation. Table 5 on page 20 shows
the possible configurations. Codes not listed in the table default to the once per second
mode to quickly alert the user of an incorrect Alarm setting.
When the clock information matches the Alarm clock settings based on the match criteria
defined by RPT5-RPT1, the AF (Alarm Flag) is set. If AFE (Alarm Flag Enable) is also set,
the Alarm condition activates the IRQ/FT/OUT pin.
Note:
If the address pointer is allowed to increment to the Flag register address, an Alarm
condition will not cause the Interrupt/Flag to occur until the address pointer is moved to a
different address. It should also be noted that if the last address written is the “Alarm
Seconds,” the address pointer will increment to the Flag address, causing this situation to
occur.
To disable the Alarm, write '0' to the Alarm date register and to RPT1–5. The IRQ/FT/OUT
output is cleared by a READ to the Flags register. This READ of the Flags register will also
reset the Alarm Flag (D6; register 0Fh). See Figure 11 on page 21.
The IRQ/FT/OUT pin can also be activated in the Battery Back-up mode. The IRQ/FT/OUT
will go low if an Alarm occurs and both ABE (Alarm in Battery Back-up mode Enable) and
AFE are set. The ABE and AFE bits are reset during power-up, therefore an Alarm
generated during power-up will only set AF. The user can read the Flag register at system
boot-up to determine if an Alarm was generated while the M41T94 was in the deselect
mode during power-up. Figure 12 on page 21 illustrates the Back-up mode Alarm timing.
Table 5.
Alarm Repeat mode
RPT5
RPT4
RPT3
RPT2
RPT1
Alarm setting
11
111
Once per Second
11
110
Once per Minute
11
100
Once per Hour
11
000
Once per Day
10
000
Once per Month
0
Once per Year
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