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M48T59 Datasheet(PDF) 16 Page - STMicroelectronics |
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M48T59 Datasheet(HTML) 16 Page - STMicroelectronics |
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16 / 32 page  Obsolete Product(s) - Obsolete Product(s) Obsolete Product(s) - Obsolete Product(s) Clock operations M48T59, M48T59Y, M48T59V 16/32 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 Table 6. Alarm repeat mode RPT4 RPT3 RPT2 RPT1 Alarm activated 1 1 1 1 Once per second 1 1 1 0 Once per minute 1 1 0 0 Once per hour 1 0 0 0 Once per day 0 0 0 0 Once per month AI01388B 15ns Min A0-A12 ACTIVE FLAG BIT IRQ/FT ADDRESS 1FF0h HIGH-Z |
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