M48T59-70PC1(2008) View Datasheet(PDF) - STMicroelectronics
Part Name
Description
Manufacturer
M48T59-70PC1 Datasheet PDF : 32 Pages
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Clock operations
M48T59, M48T59Y, M48T59V
alarm condition activates the IRQ/FT pin. To disable the alarm, write '0' to the Alarm Date
Register and RPT1-4. The Alarm Flag and the IRQ/FT output are cleared by a READ to the
Flags Register as shown in Figure 10 on page 16. 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 the ABE (Alarm in Battery Back-up Mode Enable) and the 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 M48T59/Y/V was in the deselect mode
during power-down. Figure 11 on page 17 illustrates the back-up mode alarm timing.
Figure 10. Alarm interrupt reset waveform
A0-A12
15ns Min
ADDRESS 1FF0h
ACTIVE FLAG BIT
t(s) IRQ/FT
te Produc Table 6. Alarm repeat mode
le RPT4
RPT3
so 1
1
b 1
1
- O 1
1
) 1
0
Obsolete Product(s 0
0
RPT2
1
1
0
0
0
RPT1
1
0
0
0
0
HIGH-Z
AI01388B
Alarm activated
Once per second
Once per minute
Once per hour
Once per day
Once per month
16/32
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