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參數(shù)資料
| 型號： | M48T201Y-70MH1 |
| 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, PDSO44 |
| 封裝： | SNAPHAT, PLASTIC, SOIC-44 |
| 文件頁數(shù)： | 13/37頁 |
| 文件大?。?/td> | 311K |
| 代理商： | M48T201Y-70MH1 |
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Clock operation
M48T201Y, M48T201V
Figure 8.
Backup mode alarm waveforms
3.6
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 timeout into the Watchdog
Register, address 7FFF7h. Bits BMB4-BMB0 store a binary multiplier and the two lower
order bits RB1-RB0 select the resolution, where 00 = 1/16 second, 01 = 1/4 second, 10 = 1
second, and 11 = 4 seconds. The amount of timeout 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).
Note:
Accuracy of timer is within ± the selected resolution.
If the processor does not reset the timer within the specified period, the M48T201Y/V sets
the WDF (watchdog flag) and generates a watchdog interrupt or a microprocessor reset.
WDF is reset by reading the flag register (address 7FFF0h).
The most significant bit of the watchdog register is the watchdog steering bit (WDS). When
set to a '0', the watchdog will activate the IRQ/FT pin when timed-out. When WDS is set to a
'1,' the watchdog will output a negative pulse on the RST pin for tREC. The watchdog register
and the AFE, SQWE, ABE, and FT bits will reset to a '0' at the end of a watchdog timeout
when the WDS bit is set to a '1.'
The watchdog timer can be reset by two methods:
1.
a transition (high-to-low or low-to-high) can be applied to the watchdog input pin (WDI)
or
2.
the microprocessor can perform a WRITE of the watchdog register.
The timeout period then starts over. The WDI pin should be tied to VSS if not used. The
watchdog will be reset on each transition (edge) seen by the WDI pin.
AI03520
VCC
IRQ/FT
HIGH-Z
VPFD (max)
VPFD (min)
AFE bit/ABE bit
AF bit in Flags Register
HIGH-Z
VSO
tREC
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| M48T201Y-70MH1E | 功能描述:監(jiān)控電路 SRAM TK Controller RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| M48T201Y-70MH1F | 功能描述:監(jiān)控電路 SRAM TK Controller RoHS:否 制造商:STMicroelectronics 監(jiān)測電壓數(shù): 監(jiān)測電壓: 欠電壓閾值: 過電壓閾值: 輸出類型:Active Low, Open Drain 人工復位:Resettable 監(jiān)視器:No Watchdog 電池備用開關:No Backup 上電復位延遲（典型值）:10 s 電源電壓-最大:5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:UDFN-6 封裝:Reel |
| M48T201Y-70MH1TR | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3V TIMEKEEPER㈢ supervisor |
| M48T201Y-80MH1 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
| M48T201Y-80MH1E | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 or 3.3 V TIMEKEEPER? supervisor |
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