參數(shù)資料
型號(hào)： M41T94MQ6E
廠(chǎng)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, PDSO16
封裝： ROHS COMPLIANT, PLASTIC, SOIC-16
文件頁(yè)數(shù)： 14/41頁(yè)
文件大?。?/td> 352K
代理商： M41T94MQ6E
M41T94
Clock operations
4.4
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:
Accuracy of timer is within ± the selected resolution.
If the processor does not reset the timer within the specified period, the M41T94 sets the
WDF (watchdog flag) and generates a watchdog interrupt or a microprocessor reset. WDF
is reset by reading the flags register (0Fh).
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/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 and the AFE, ABE, SQWE, and FT 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. The WDI pin should be tied to VSS if not used. 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.
Should the watchdog timer time-out, and the WDS bit is programmed to output an interrupt,
a value of 00h needs to be written to the watchdog register in order to clear the IRQ/FT/OUT
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 to output to the IRQ/FT/OUT pin and the frequency
test (FT) function is activated, the watchdog function prevails and the frequency test function
is denied.
4.5
Square wave output
The M41T94 offers the user a programmable square wave function which is output on the
SQW pin. RS3-RS0 bits located in 13h establish the square wave output frequency. These
frequencies are listed in Table Table 6 on page 22. Once the selection of the SQW
frequency has been completed, the SQW pin can be turned on and off under software
control with the square wave enable bit (SQWE) located in register 0Ah.
相關(guān)PDF資料
PDF描述
M43C505 4-BIT, MROM, 2 MHz, MICROCONTROLLER
M43C505 4-BIT, MROM, 2 MHz, MICROCONTROLLER
M45C535 4-BIT, MROM, 1 MHz, MICROCONTROLLER
M440T513Y-15ZA9 REAL TIME CLOCK, PBGA168
M44C892 4-BIT, MROM, 4 MHz, MICROCONTROLLER, PDSO20
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M41T94MQ6F 功能描述:實(shí)時(shí)時(shí)鐘 Serial 512 (64x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)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
M41T94MQ6TR 功能描述:實(shí)時(shí)時(shí)鐘 Advanced Analog RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 總線(xiàn)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
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M41TC8025 制造商:STMICROELECTRONICS 制造商全稱(chēng):STMicroelectronics 功能描述:Highly accurate, temperature-compensated serial real-time clock (RTC) with embedded crystal
M41TC8025AMC6F 制造商:STMicroelectronics 功能描述:Real Time Clock Serial 14-Pin SOIC T/R 制造商:STMicroelectronics 功能描述:HIGH-END SENSOR AND ANALOG - Tape and Reel 制造商:STMicroelectronics 功能描述:HIGH-END SENSOR and ANALOG
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