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M48T201V Datasheet(PDF) 18 Page - STMicroelectronics

No. de pieza M48T201V
Descripción Electrónicos  5.0 or 3.3V TIMEKEEPER짰 supervisor
PDF  35 Pages
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Fabricante Electrónico  STMICROELECTRONICS [STMicroelectronics]
Página de inicio  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M48T201V Datasheet(HTML) 18 Page - STMicroelectronics

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Clock operation
M48T201Y, M48T201V
18/35
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 back-up 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 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 M48T201Y/V was in the deselect mode
during power-up. Figure 8 on page 19 illustrates the back-up mode alarm timing.
Figure 7.
Alarm interrupt reset waveforms
Table 6.
Alarm repeat modes
RPT5
RPT4
RPT3
RPT2
RPT1
Alarm setting
1
1
1
1
1
Once per Second
1
1
1
1
0
Once per Minute
1
1
1
0
0
Once per Hour
11
00
0
Once per Day
1
0
0
0
0
Once per Month
00
00
0
Once per Year
AI02331
A0-A18
ACTIVE FLAG BIT
ADDRESS 7FFF0h
IRQ/FT
15ns Min
HIGH-Z



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