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M41ST87YMX6TR 데이터시트(PDF) 33 Page - STMicroelectronics |
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M41ST87YMX6TR 데이터시트(HTML) 33 Page - STMicroelectronics |
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33 / 54 page ![]() 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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