- 您現在的位置：買賣IC網 > PDF目錄45049 > M41T64Q6F (STMICROELECTRONICS) 1 TIMER(S), REAL TIME CLOCK, QCC16 PDF資料下載
參數資料
| 型號： | M41T64Q6F |
| 廠商： | STMICROELECTRONICS |
| 元件分類： | 時鐘/數據恢復及定時提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, QCC16 |
| 封裝： | 3 X 3 MM, LEAD FREE, QFN-16 |
| 文件頁數： | 19/40頁 |
| 文件大?。?/td> | 707K |
| 代理商： | M41T64Q6F |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁當前第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁
Clock operation
M41T62/63/64/65
Doc ID 10397 Rev 12
3.4
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 three bits RB2-RB0 select the resolution
where:
000=1/16 second (16 Hz);
001=1/4 second (4 Hz);
010=1 second (1 Hz);
011=4 seconds (1/4 Hz); and
100 = 1 minute (1/60 Hz).
Note:
Invalid combinations (101, 110, and 111) will NOT enable a watchdog time-out. Setting the
BMB4-BMB0 = 0 with any combination of RB2-RB0, other than 000, will result in an
immediate watchdog time-out.
The amount of time-out is then determined to be the multiplication of the five-bit multiplier
value with the resolution. (For example: writing 00001110 in the watchdog register = 3*1 or 3
seconds). If the processor does not reset the timer within the specified period, the M41T6x
sets the WDF (watchdog flag) and generates an interrupt on the IRQ pin (M41T62), or a
watchdog output pulse (M41T63 and M41T65 only) on the WDO pin. The watchdog timer
can only be reset by having the microprocessor perform a WRITE of the watchdog register.
The time-out period then starts over.
Should the watchdog timer time-out, any value may be written to the watchdog register in
order to clear the IRQ pin. A value of 00h will disable the watchdog function until it is again
programmed to a new value. 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.
Note:
A WRITE to any clock register will restart the watchdog timer.
3.5
Watchdog output (WDO - M41T63/65 only)
If the processor does not reset the watchdog timer within the specified period, the watchdog
connected to the reset input of the processor in order to generate a processor reset. After a
watchdog time-out occurs, the timer will remain disabled until such time as a new
countdown value is written into the watchdog register.
Note:
The crystal oscillator must be running for the WDO pulse to be available.
相關PDF資料 |
PDF描述 |
|---|---|
| M41T66Q6F | REAL TIME CLOCK, QCC16 |
| M41T81M6F | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
| M41T81MY6TR | 1 TIMER(S), REAL TIME CLOCK, PDSO18 |
| M41T81MX6 | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| M41T81SM6F | 1 TIMER(S), REAL TIME CLOCK, PDSO8 |
相關代理商/技術參數 |
參數描述 |
|---|---|
| M41T65 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial Access Real-Time Clock with Alarms |
| M41T65Q6F | 功能描述:實時時鐘 1.3V to 3.6V w/Alarm 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 |
| M41T65Q6F-CUT TAPE | 制造商:ST 功能描述:M41T65 Series 1.3 to 4.4 V Serial I2C Real Time Clock Surface Mount - QFN-16 |
| M41T66 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial access real-time clock with alarms |
| M41T66_11 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial real-time clock with alarms |
發(fā)布緊急采購，3分鐘左右您將得到回復。