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参数资料
| 型号： | M41ST87YWX6 |
| 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, PLASTIC, SO-28 |
| 文件页数： | 26/38页 |
| 文件大小： | 569K |
| 代理商： | M41ST87YWX6 |
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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 da-
ta. 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 insuffi-
cient 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 back-up. 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 back-up.
Initial Power-on Defaults
Table 15. Century Bits Examples
Note: 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).
Table 16. tREC Definitions
Note: 1. Default Setting
CB0
CB1
Leap Year?
Example(1)
00
Yes
2000
0
1
No
2100
1
0
No
2200
1
No
2300
tREC Bit (TR)
STOP Bit (ST)
tREC Time
Units
Min
Max
00
96
98(1)
ms
0
1
40
200
ms
1X
50
2000
s
相关PDF资料 |
PDF描述 |
|---|---|
| M41T00M6F | REAL TIME CLOCK, PDSO8 |
| M41T00M6E | REAL TIME CLOCK, PDSO8 |
| M41T00M6 | 0 TIMER(S), REAL TIME CLOCK, PDSO8 |
| M41T0DS6 | REAL TIME CLOCK, PDSO8 |
| M41T0DS6T | REAL TIME CLOCK, PDSO8 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M41ST95W | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor |
| M41ST95WMH6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor |
| M41ST95WMH6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor |
| M41ST95WMH6F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor |
| M41ST95WMH6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.0V, 512 bit (64 bit X 8) Serial RTC (SPI) SRAM and NVRAM Supervisor |
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