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参数资料
| 型号： | M48T212Y-70MH1TR |
| 厂商： | STMICROELECTRONICS |
| 元件分类： | 时钟/数据恢复及定时提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| 封装： | 0.330 INCH, PLASTIC, SOH-44 |
| 文件页数： | 8/32页 |
| 文件大小： | 473K |
| 代理商： | M48T212Y-70MH1TR |
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M48T212Y, M48T212V
16/32
Setting the Alarm Clock
Address locations 6h-2h contain the alarm set-
tings. The alarm can be configured to go off at a
prescribed time on a specific month, date, hour,
minute, or second or repeat every year, month,
day, hour, minute, or second. It can also be pro-
grammed to go off while the M48T212Y/V is in the
battery back-up to serve as a system wake-up call.
Bits RPT5-RPT1 put the alarm in the repeat mode
of operation. Table 8 shows the possible configu-
rations. 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 registers and
RPT1-5. The IRQ/FT output is cleared by a READ
to the Flags Register as shown in Figure 8. A sub-
sequent 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 bat-
tery back-up mode. The IRQ/FT will go low if an
alarm occurs and both ABE (Alarm in Battery
Back-up 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 M48T212Y/V was in the deselect mode
during power-up. Figure 9., page 17 illustrates the
back-up mode alarm timing.
Figure 8. Alarm Interrupt Reset Waveforms
Table 8. Alarm Repeat Modes
RPT5
RPT4
RPT3
RPT2
RPT1
Alarm Setting
1111
1
Once per Second
1111
0
Once per Minute
1110
0
Once per Hour
1100
0
Once per Day
1000
0
Once per Month
0000
0
Once per Year
AI03021
A0-A3
ACTIVE FLAG BIT
ADDRESS 0h
IRQ/FT
HIGH-Z
1h
Fh
相关PDF资料 |
PDF描述 |
|---|---|
| M48T212Y-70MH1F | REAL TIME CLOCK, PDSO44 |
| M48T212Y-70MH1 | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
| M48T212V-85MH6E | REAL TIME CLOCK, PDSO44 |
| M48T212V-85MH6F | REAL TIME CLOCK, PDSO44 |
| M48T212Y-70MH6 | 0 TIMER(S), REAL TIME CLOCK, PDSO44 |
相关代理商/技术参数 |
参数描述 |
|---|---|
| M48T212Y-70MH6 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212Y-70MH6E | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212Y-70MH6F | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER CONTROLLER Supervisor |
| M48T212Y-70MH6TR | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
| M48T212Y-85MH1 | 制造商:STMICROELECTRONICS 制造商全称:STMicroelectronics 功能描述:5V/3.3V TIMEKEEPER[ CONTROLLER |
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