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参数资料
| 型号： | M48T201V-85MH1E |
| 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, PDSO44 |
| 封装： | SNAPHAT, ROHS COMPLIANT, PLASTIC, SOIC-44 |
| 文件页数： | 11/37页 |
| 文件大小： | 311K |
| 代理商： | M48T201V-85MH1E |
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M48T201Y, M48T201V
Clock operation
3.5
Setting the alarm clock
Registers 7FFF6h-7FFF2h contain the alarm settings. The alarm can be configured to go off
at a prescribed time on a specific month, day of month, hour, minute, or second or repeat
every month, day of month, hour, minute, or second.
It can also be programmed to go off while the M48T201Y/V is in the battery backup to serve
as a system wake-up call.
Bits RPT5-RPT1 put the alarm in the repeat mode of operation. Table 6 shows the possible
configurations. Codes not listed in the table default to the once per second mode to quickly
alert the user of an incorrect alarm setting.
Note:
User must transition address (or toggle chip enable) to see flag bit change.
When the clock information matches the alarm clock settings based on the match criteria
defined by RPT5-RPT1, the AF (alarm flag) is set. If AFE (alarm flag enable) is also set, the
alarm condition activates the IRQ/FT pin. To disable alarm, write ’0’ to the alarm-date
register and RPT1-5. The IRQ/FT output is cleared by a READ to the flags register as
shown in Figure 7. 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/FT pin can also be activated in the battery backup mode. The IRQ/FT 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 M48T201Y/V was in the deselect mode during power-up.
Figure 8 on page 20 illustrates the backup mode alarm timing.
Figure 7.
Alarm interrupt reset waveforms
Table 6.
Alarm repeat modes
RPT5
RPT4
RPT3
RPT2
RPT1
Alarm setting
1
Once per second
1
0
Once per minute
1
0
Once per hour
1
0
Once per day
1
0
Once per month
0
Once per year
AI02331
A0-A18
ACTIVE FLAG BIT
ADDRESS 7FFF0h
IRQ/FT
15ns Min
HIGH-Z
相关PDF资料 |
PDF描述 |
|---|---|
| M48T201Y-70MH1E | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201V-85MH6TR | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201Y-70MH6 | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T201Y-70MHTR | 1 TIMER(S), REAL TIME CLOCK, PDSO44 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T201V-85MH1F | 功能描述:监控电路 SRAM TK Controller RoHS:否 制造商:STMicroelectronics 监测电压数: 监测电压: 欠电压阈值: 过电压阈值: 输出类型:Active Low, Open Drain 人工复位:Resettable 监视器:No Watchdog 电池备用开关:No Backup 上电复位延迟（典型值）:10 s 电源电压-最大:5.5 V 最大工作温度:+ 85 C 安装风格:SMD/SMT 封装 / 箱体:UDFN-6 封装:Reel |
| M48T201V-85MH1TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5.0 or 3.3V TIMEKEEPER㈢ supervisor |
| M48T201VMH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
| M48T201VSH | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
| M48T201Y | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:3.3V-5V TIMEKEEPER CONTROLLER |
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