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參數(shù)資料
| 型號： | M41T81MX6 |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數(shù)據(jù)恢復及定時提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封裝： | 0.300 INCH, PLASTIC, SO-28 |
| 文件頁數(shù)： | 9/30頁 |
| 文件大小： | 436K |
| 代理商： | M41T81MX6 |
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M41T81
Table 3. Alarm Repeat Modes
Watchdog Timer
The watchdog timer can be used to detect an out-
of-control microprocessor. The user programs the
watchdog timer by setting the desired amount of
time-out into the Watchdog Register, address 09h.
Bits BMB4-BMB0 store a binary multiplier and the
two lower order bits RB1-RB0 select the resolu-
tion, where 00 = 1/16 second, 01 = 1/4 second,
10 = 1 second, and 11 = 4 seconds. The amount
of time-out is then determined to be the multiplica-
tion of the five-bit multiplier value with the resolu-
tion. (For example: writing 00001110 in the
Watchdog Register = 3*1, or 3 seconds). If the
processor does not reset the timer within the spec-
ified period, the M41T81 sets the WDF (Watchdog
Flag) and generates a watchdog interrupt.
The watchdog timer can be reset by having the mi-
croprocessor perform a WRITE of the Watchdog
Register. The time-out period then starts over.
Should the watchdog timer time-out, a value of
00h needs to be written to the Watchdog Register
in order to clear the IRQ/FT/OUT/SQW pin. This
will also disable the watchdog function until it is
again programmed correctly. A READ of the Flags
Register will reset the Watchdog Flag (Bit D7;
Register 0Fh).
The watchdog function is automatically disabled
upon power-up and the Watchdog Register is
cleared. If the watchdog function is set, the fre-
quency test function is activated, and the SQWE
Bit is '0,' the watchdog function prevails and the
frequency test function is denied.
RPT5
RPT4
RPT3
RPT2
RPT1
Alarm Setting
1
Once per Second
1
0
Once per Minute
1
0
Once per Hour
1
000
Once per Day
1
0
Once per Month
0
000
Once per Year
相關PDF資料 |
PDF描述 |
|---|---|
| M41T81SM6F | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| M41T81SM6E | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| M41T82RMY6E | 1 TIMER(S), REAL TIME CLOCK, PDSO18 |
| M41T82ZQA6E | 1 TIMER(S), REAL TIME CLOCK, QCC16 |
| M41T82RQA6F | 1 TIMER(S), REAL TIME CLOCK, QCC16 |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M41T81MX6TR | 功能描述:實時時鐘 Serial 512 (64x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線接口:I2C 日期格式:DW:DM:M:Y 時間格式:HH:MM:SS RTC 存儲容量:64 B 電源電壓-最大:5.5 V 電源電壓-最小:1.8 V 最大工作溫度:+ 85 C 最小工作溫度: 安裝風格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube |
| M41T81MY | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:SERIAL ACCESS RTC WITH ALARMS |
| M41T81MY6 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Real-Time Clock with Alarms |
| M41T81MY6TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Real-Time Clock with Alarms |
| M41T81S | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock with alarms |
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