M48T513V-80PL1 View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M48T513V-80PL1 Datasheet PDF : 31 Pages
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M48T513Y, M48T513V
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 condi-
tion 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 13. A subse-
quent READ of the Flags Register is necessary to
see that the value of the Alarm Flag has been re-
set 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 M48T513Y/V was in the deselect mode
during power-up. Figure Figure 14, page 20 illus-
trates the back-up mode alarm timing.
Figure 13. Alarm Interrupt Reset Waveform
AD0-AD7
15ns Min
ADDRESS 1FF0h
ACTIVE FLAG BIT
IRQ/FT
Table 12. Alarm Repeat Mode
RPT5
RPT4
1
1
1
1
1
1
1
1
1
0
0
0
RPT3
1
1
1
0
0
0
RPT2
1
1
0
0
0
0
HIGH-Z
AI02581
RPT1
1
0
0
0
0
0
Alarm Activated
Once per Second
Once per Minute
Once per Hour
Once per Day
Once per Month
Once per Year
19/31
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