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參數(shù)資料
| 型號： | M41T82SM6F |
| 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)： | 36/61頁 |
| 文件大?。?/td> | 983K |
| 代理商： | M41T82SM6F |
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M41T82-M41T83
Clock operation
Doc ID 12578 Rev 12
The oscillator must start and have run for at least 4 seconds before attempting to reset the
OF bit to 0.
The oscillator fail detect circuit funtions during backup mode. If a triggering event occurs to
disrupt the oscillator during a power-down condition, the OF bit will be set accordingly.
3.13
Oscillator fail interrupt enable (M41T83 only)
With the OFIE bit set, the OF bit will cause the IRQ1/FT/OUT output to be asserted (see
Section 3.14.1 and 3.14.2 for additional conditions that apply). The IRQ1/FT/OUT output is
cleared by resetting the OF bit to 0 (NOT by reading the flags register). Clearing the OFIE bit
will also cause the IRQ1/FT/OUT output to de-assert, but if OFIE is subsequently set prior to
clearing OF, the IRQ1/FT/OUT output will assert immediately upon setting OFIE. Clearing
the OF bit is necessary to prevent such an inadvertent interrupt.
If the alarm in backup enable bit, ABE, is set (along with OFIE), the oscillator fail detect will
cause an interrupt in the IRQ1/FT/OUT pin during backup mode. For additional information
on this, refer to Section 3.14.2.
3.14
IRQ1/FT/OUT pin, frequency test, interrupts and the OUT bit
(M41T83 only)
Four interrupt sources, the frequency test function, and the discrete output bit OUT all share
the IRQ1/FT/OUT pin. Priority is built into the part such that some functions dominate
others. Additionally, the priority depends on configuration bits such as OUT and ABE, and
on whether the part is operating on VCC or is in the backup mode. This pin is an open drain
output and requires an external pull-up resistor.
Figure 23 shows the various signal sources and controlling bits for the IRQ1/FT/OUT output
pin.
Figure 23.
IRQ1/FT/OUT output pin circuit
TIMER
TF
OFIE
AI1E
WDOG
OF
Q
PRE
reload
AF1
WDF
OUT
FT
A1IE
OFIE
TIE
w-dog running
ABE
IRQ1/OUT/FT
TE
Write OF to 0
to clear
Read FLAGS register
to clear
Write watchdog register
to clear
IRQ1/OUT/FT
LOGIC
TI/TP
TIE
AM03013v1
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