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参数资料
| 型号： | M41ST87WMX6 |
| 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： | 28/52页 |
| 文件大小： | 689K |
| 代理商： | M41ST87WMX6 |
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Clock operation
M41ST87Y, M41ST87W
Doc ID 9497 Rev 8
alarm condition activates the IRQ/OUT pin as shown in Figure 25 on page 35. To disable
the alarm, write '0' to the alarm date register and to RPT5–RPT1.
If the address pointer is allowed to increment to the flag register address, an alarm condition
will not cause the interrupt/flag to occur until the address pointer is moved to a different
address. It should also be noted that if the last address written is the “alarm seconds,” the
address pointer will increment to the flag address, causing this situation to occur. Thus the
user should not leave the address pointer at 0Fh if using the alarm interrupt function. This is
easily handled by simply reading past the flags registers before teminating a read sequence.
The IRQ/OUT output is cleared by a READ to the flags register. A subsequent READ of the
flags register is necessary to see that the value of the alarm flag has been reset to '0.'
The IRQ/OUT pin can also be activated in the battery backup mode. The IRQ/OUT will go
low if an alarm occurs and both ABE (alarm in battery backup mode enable) and AFE are
set. The ABE and AFE bits are reset during power-up, therefore an alarm generated during
power-up will only set AF. The user can read the flag register at system boot-up to
determine if an alarm was generated while the M41ST87Y/W was in the deselect mode
during power-up. Figure 25 on page 35 illustrates the backup mode alarm timing.
Figure 24.
Alarm interrupt reset waveform
Table 8.
Alarm repeat modes
RPT5
RPT4
RPT3
RPT2
RPT1
Alarm setting
1
1111
Once per second
1
1110
Once per minute
1
1100
Once per hour
1
1000
Once per day
1
0000
Once per month
0
0000
Once per year
AI07086
IRQ/OUT
ACTIVE FLAG
0Fh
0Eh
10h
HIGH-Z
ADDRESS POINTER
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M41ST87WMX6F | 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 |
| M41ST87WMX6TR | 功能描述:实时时钟 Serial 1280 (160x8) RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| M41ST87WSS6 | 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 |
| M41ST87WSS6F | 功能描述:实时时钟 128 NVRAM Serial RTC 3.0 to 3.6 Vcc RoHS:否 制造商:Microchip Technology 功能:Clock, Calendar. Alarm RTC 总线接口:I2C 日期格式:DW:DM:M:Y 时间格式:HH:MM:SS RTC 存储容量:64 B 电源电压-最大:5.5 V 电源电压-最小:1.8 V 最大工作温度:+ 85 C 最小工作温度: 安装风格:Through Hole 封装 / 箱体:PDIP-8 封装:Tube |
| M41ST87Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0, 3.3, or 3.0V, 1280 bit (160 x8) Secure Serial RTC and NVRAM Supervisor with Tamper Detection |
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