參數(shù)資料
型號(hào)： M41ST87WMX6
廠商： STMICROELECTRONICS
元件分類(lèi)： 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, PDSO28
封裝： 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOX-28
文件頁(yè)數(shù)： 29/52頁(yè)
文件大小： 689K
代理商： M41ST87WMX6
M41ST87Y, M41ST87W
Clock operation
Doc ID 9497 Rev 8
Figure 25.
Backup mode alarm waveform
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 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 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).
Note:
The accuracy of the timer is within ± the selected resolution.
If the processor does not reset the timer within the specified period, the M41ST87Y/W sets
the WDF (watchdog flag) and generates either a watchdog interrupt or a microprocessor
reset.
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/OUT 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, FT, AFE, ABE and SQWE bits will reset to a '0' at the end of a watchdog time-out
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 time-out period then starts over.
Note:
The WDI pin should be tied to VSS if not used and is only available in the SOX28 (MX)
package.
In order to perform a software reset of the watchdog timer, the original time-out period can
be written into the watchdog register, effectively restarting the count-down cycle.
AI07087
VCC
IRQ/OUT
VPFD
ABE, AFE Bits in Interrupt Register
AF bit in Flags Register
HIGH-Z
VSO
HIGH-Z
trec
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PDF描述
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M41ST87WMX6F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
M41ST87WMX6TR 功能描述:實(shí)時(shí)時(shí)鐘 Serial 1280 (160x8) 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M41ST87WSS6 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0 V and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
M41ST87WSS6F 功能描述:實(shí)時(shí)時(shí)鐘 128 NVRAM Serial RTC 3.0 to 3.6 Vcc 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(shí)間格式:HH:MM:SS RTC 存儲(chǔ)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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M41ST87Y 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:5.0, 3.3, or 3.0V, 1280 bit (160 x8) Secure Serial RTC and NVRAM Supervisor with Tamper Detection
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