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參數(shù)資料
| 型號： | M41ST84 |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | 5.0 OR 3.0V, 512 bit (64 x 8) Serial RTC with supervisory functions(具有監(jiān)控功能的5.0V或3.0V，512位(64 x 8)串行RTC) |
| 中文描述： | 5.0或3.0V，512位（64 × 8）（具有監(jiān)控功能的5.0V或3.0V，512位（64 × 8）串行時鐘監(jiān)督職能的串行時鐘） |
| 文件頁數(shù)： | 18/31頁 |
| 文件大?。?/td> | 181K |
| 代理商： | M41ST84 |
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M41ST84Y, M41ST84W
18/31
Setting Alarm Clock Registers
Address locations 0Ah-0Eh contain the alarm set-
tings. 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 pro-
grammed to gooff while theM41ST84Y/W is inthe
battery back-upto serveas a system wake-up call.
Bits RPT5-RPT1 put the alarm in the repeat mode
of operation. Table 10, page 18 shows the possi-
ble configurations.Codes not listedinthe table de-
fault 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 condi-
tion activates the IRQ/FT/OUT pin.
Note:
If the address pointer is allowed to incre-
ment to the Flag Register address, an alarm con-
dition will notcause theInterrupt/Flag tooccur until
the address pointer is moved to a different ad-
dress. It should also be noted that if the last ad-
dress written is the “Alarm Seconds,” the address
pointer will increment to the Flag address,causing
this situation to occur.
The IRQ/FT/OUT output is cleared by a READ to
the Flags Register as shown in Figure 17. A sub-
sequent READ of the Flags Register is necessary
to see that the value of the Alarm Flag has been
reset to ’0.’
The IRQ/FT/OUT pin can also be activated in the
battery back-up mode. The IRQ/FT/OUT will go
low ifan alarm occurs and both ABE (Alarm inBat-
tery 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 M41ST84Y/W was in the de-
select mode during power-up. Figure 18, page 19
illustrates the back-up mode alarm timing.
Figure 17. Alarm Interrupt Reset Waveform
Table 10. Alarm Repeat Modes
RPT5
RPT4
RPT3
RPT2
RPT1
Alarm Setting
1
1
1
1
1
Once per Second
1
1
1
1
0
Once per Minute
1
1
1
0
0
Once per Hour
1
1
0
0
0
Once per Day
1
0
0
0
0
Once per Month
0
0
0
0
0
Once per Year
AI03664
IRQ/FT/OUT
ACTIVE FLAG
0Fh
0Eh
10h
HIGH-Z
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| M41ST84W | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS |
| M41ST84W_08 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:3.0/3.3 V I2C serial RTC with 44 bytes of NVRAM and supervisory functions |
| M41ST84WMH | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS |
| M41ST84WMH1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS |
| M41ST84WMH1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit 64 x 8 SERIAL RTC with SUPERVISORY FUNCTIONS |
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