參數(shù)資料
型號： M41T83RM6E
廠商： STMICROELECTRONICS
元件分類： 時鐘/數(shù)據(jù)恢復(fù)及定時提取
英文描述： 1 TIMER(S), REAL TIME CLOCK, PDSO8
封裝： 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
文件頁數(shù)： 28/61頁
文件大?。?/td> 983K
代理商： M41T83RM6E
Clock operation
M41T82-M41T83
Doc ID 12578 Rev 12
3.6
Optional second programmable alarm and user SRAM
When the alarm 2 enable (AL2E) bit (D1 of address 13h) is set to a logic 1, registers 14h
through 18h provide control for a second programmable alarm which operates in the same
manner as the alarm function described in Section 3.5. The AL2E bit defaults on initial
power-up to a logic 0 (alarm 2 disabled). In this mode, the five alarm 2 bytes (14h-18h)
function as additional user SRAM, for a total of 12 bytes of user SRAM.
With AL2E set to 1, the alarm is enabled, and will cause the AF2 bit to be set when the
alarm condition is met. On the M41T83, if the A2IE (alarm 2 interrupt enable) bit is set, an
interrupt will be asserted on IRQ2. The interrupt is de-asserted when the alarm flags are
cleared by reading the flags register (0Fh).
IRQ2 can be enabled in backup mode by setting ABE to 1 (in conjuction with setting A2IE).
3.7
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). If the processor does not reset the timer within the
specified period, the M41T8x sets the WDF (watchdog flag).
The watchdog timer is reset by writing to the watchdog register. The time-out period then
starts over.
M41T83 watchdog interrupt
On the M41T83, provided that the necessary configuration bits are set, the IRQ/FT/OUT
output will be asserted when the watchdog times out (see Section 3.14 for additional
conditions which apply).
Should the watchdog time out, to de-assert the IRQ1/FT/OUT output, the lower seven bits of
the watchdog register (09h) must be written. This will de-assert the output and re-initialize
the watchdog. Writing these seven bits to 0 will de-assert the output and disable the
watchdog.
Table 8.
Alarm repeat modes
RPT5
RPT4
RPT3
RPT2
RPT1
Alarm setting
11111
Once per second
11110
Once per minute
11100
Once per hour
11000
Once per day
10000
Once per month
00000
Once per year
相關(guān)PDF資料
PDF描述
M41T83SQA6E 1 TIMER(S), REAL TIME CLOCK, QCC16
M41T83SQA6F 1 TIMER(S), REAL TIME CLOCK, QCC16
M41T83RQA6F 1 TIMER(S), REAL TIME CLOCK, QCC16
M41T83SMY6F 1 TIMER(S), REAL TIME CLOCK, PDSO18
M41T93ZMY6F 1 TIMER(S), REAL TIME CLOCK, PDSO18
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M41T83RM6F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T83RMY6E 功能描述:實時時鐘 Serial I2C bus RTC 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M41T83RMY6F 功能描述:實時時鐘 Serial I2C bus RTC 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(fēng)格:Through Hole 封裝 / 箱體:PDIP-8 封裝:Tube
M41T83RQ6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T83RQ6F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
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