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M41ST87WMX6TR Datasheet(PDF) 33 Page - STMicroelectronics

Part # M41ST87WMX6TR
Description  5.0 and 3.3/3.0 V secure serial RTC and NVRAM supervisor with tamper detection and 128 bytes of clearable NVRAM
PDF  54 Pages
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Manufacturer  STMICROELECTRONICS [STMicroelectronics]
Direct Link  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

M41ST87WMX6TR Datasheet(HTML) 33 Page - STMicroelectronics

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M41ST87W
Clock operation
DocID9497 Rev 11
33/54
interrupt function. This is easily handled by simply reading past the flags registers before
teminating a read sequence.
The
IRQ/OUToutputisclearedbyaREADtotheflagsregister.AsubsequentREADofthe
flags register is necessary to see that the value of the alarm flag has been reset to '0.'
The
IRQ/OUTpincanalsobeactivatedinthebatterybackupmode.TheIRQ/OUTwillgo
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 M41ST87Y/W was in the deselect mode
during power-up. Figure 25: "Backup mode alarm waveform" illustrates the backup mode
alarm timing.
Figure 24: Alarm interrupt reset waveform
Table 9: 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
1
1
0
0
0
Once per day
1
0
0
0
0
Once per month
0
0
0
0
0
Once per year
IRQ/OU T
ACTIVE FLAG
0Fh
0Eh
10h
HIGH-Z
ADDRESS POINTER



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