參數(shù)資料
型號(hào)： M41T82SM6F
廠商： STMICROELECTRONICS
元件分類： 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, PDSO8
封裝： 0.150 INCH, ROHS COMPLIANT, PLASTIC, SOP-8
文件頁(yè)數(shù)： 31/61頁(yè)
文件大?。?/td> 983K
代理商： M41T82SM6F
M41T82-M41T83
Clock operation
Doc ID 12578 Rev 12
3.8.2
Timer flag (TF)
At the end of a timer countdown, when the timer reloads, TF is set to logic '1.' Regardless of
the state of TF bit (or TI/TP bit), the timer will continue decrementing and reloading.
If both timer and alarm interrupts are used in the application, the source of the interrupt can
be determined by reading the flag bits. Refer to Section 3.14 for more information on the
interaction of these bits. The TF bit is cleared by reading the flags register. This will de-
assert an interrupt output due to the timer.
3.8.3
Timer interrupt enable (TIE, M41T83 only)
In normal interrupt mode (TI/TP = 0), when TF is asserted, the interrupt output is asserted (if
TIE = 1). To de-assert the interrupt, the TF bit or the TIE bit must be reset. Disabling the
interrupt by clearing the TIE bit will de-assert the output, but does not clear the TF bit. Thus,
if TIE is re-enabled prior to clearing TF, the interrupt will assert immediately.
3.8.4
Timer enable (TE)
●
TE = 0
When the timer register (10h) is set to 0, the timer is disabled.
●
TE = 1
The timer is enabled. TE is reset (disabled) on power-down. When re-enabled, the
counter will begin counting from the same value as when it was disabled.
3.8.5
TD1/0
These are the timer source clock frequency selection bits (see Table 12). These bits
determine the source clock for the countdown timer (see Table 10 on page 36). When not in
use, the TD1 and TD0 bits should be set to 11 (1/60 Hz) for power saving.
3.9
Square wave output (M41T83 only)
The M41T83 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 13. 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.
Note:
If the SQWE bit is set to '1' and VCC falls below the switchover (VSO) voltage, the square
wave output will be disabled.
Table 12.
Timer source clock frequency selection (244.1 s to 4.25 hrs)
TD1
TD0
Timer source clock frequency (Hz)
0
4096 (244.1 s)
0
1
64 (15.6 ms)
10
1 (1 s)
1
1/60 (60 s)
相關(guān)PDF資料
PDF描述
M41T82ZM6E 1 TIMER(S), REAL TIME CLOCK, PDSO8
M41T83RM6E 1 TIMER(S), REAL TIME CLOCK, PDSO8
M41T83SQA6E 1 TIMER(S), REAL TIME CLOCK, QCC16
M41T83SQA6F 1 TIMER(S), REAL TIME CLOCK, QCC16
M41T83RQA6F 1 TIMER(S), REAL TIME CLOCK, QCC16
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
M41T82SMY6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T82SMY6F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T82SQ6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T82SQ6F 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial RTC with battery switchover
M41T82SQA6E 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:Serial I2C bus RTC with battery switchover
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