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参数资料
| 型号： | M41ST87YMX6TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 1 TIMER(S), REAL TIME CLOCK, PDSO28 |
| 封装： | 0.300 INCH, ROHS COMPLIANT, PLASTIC, SOX-28 |
| 文件页数： | 32/48页 |
| 文件大小： | 457K |
| 代理商： | M41ST87YMX6TR |
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Clock operation
M41ST87Y, M41ST87W
3.14
trec bit
Bit D7 of clock register 04h contains the trec bit (TR). trec refers to the automatic continuation
of the deselect time after VCC reaches VPFD. This allows for a voltage settling time before
WRITEs may again be performed to the device after a power-down condition. The trec bit will
allow the user to set the length of this deselect time as defined by Table 12 on page 39.
3.15
Electronic serial number
The M41ST87Y/W has a unique 8-byte lasered, serial number with parity. This serial
number is “read only” and is generated such that no two devices will contain an identical
number.
3.16
Oscillator stop detection
If the oscillator fail (OF) bit is internally set to a '1,' this indicates that the oscillator has either
stopped, or was stopped for some period of time and can be used to judge the validity of the
clock and date data. This bit will be set to '1' any time the oscillator stops. The following
conditions can cause the OF bit to be set:
●
The first time power is applied (defaults to a '1' on power-up).
●
The voltage present on VCC or battery is insufficient to support oscillation.
●
The ST bit is set to '1.'
If the oscillator fail interrupt enable bit (OFIE) is set to a '1,' the IRQ/OUT pin will also be
activated. The IRQ/OUT output is cleared by resetting the OF bit to '0,' resetting the OFIE bit
to '0,' or the RST output is enabled (NOT by reading the flag register).
The OF bit will remain set to '1' until written to logic '0.' The oscillator must start and have
run for at least 4 seconds before attempting to reset the OF bit to '0.' This function operates
both under normal power and in battery backup. If the trigger event occurs during a power-
down condition, this bit will be set correctly.
Note:
The ABE bit must be set to '1' for the IRQ/OUT pin to be activated in battery backup.
3.17
Initial power-on defaults
Table 11.
Century bits examples
CB0
CB1
Leap year?
Example(1)
1.
Leap year occurs every four years (for years evenly divisible by four), except for years evenly divisible by
100. The only exceptions are those years evenly divisible by 400 (the year 2000 was a leap year, year
2100 is not).
0
Yes
2000
0
1
No
2100
1
0
No
2200
1
No
2300
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| M41ST87YSS6 | 制造商:STMICROELECTRONICS 制造商全称: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 |
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