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RS5C372A-E2-F Datasheet(PDF) 16 Page - RICOH electronics devices division |
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RS5C372A-E2-F Datasheet(HTML) 16 Page - RICOH electronics devices division |
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16 / 57 page  RS5C372A/B 15 5. Oscillation halt sensing The oscillation halt sensing function uses a register to store oscillation halt information. This function may be used to determine if the RS5C372A/B supply power has been booted from 0V and if it has been backed up. This function is useful for determining if clock data is valid or invalid. 6. Periodic interrupt RS5C372A The RS5C372A can output periodic interrupt pulses in addition to alarm function from the INTRA and INTRB pins. This frequency may be selected from 2Hz (every 0.5 seconds), 1Hz (every second), 1/60Hz (every minute), 1/3600Hz (every hour) and monthly (1st of month). Output wave form for periodic interrupt may be selected from regular pulse waveform (2Hz and 1Hz) and waveforms (every second, every minute, every hour and every month) that are appropriate for CPU level interrupt. Outputs may be selected either INTRA or INTRB . The RS5C372A has polling function that monitors pin status in the register. RS5C372B The RS5C372B can output periodic interrupt pulses in addition to alarm function from the INTR pin. This frequency may be selected from 2Hz (every 0.5 seconds), 1Hz (every second), 1/60Hz (every minute), 1/3600Hz (every hour) and monthly (1st of month). Output wave form for periodic interrupt may be selected from regular pulse waveform (2Hz and 1Hz) and waveforms (every second, every minute, every hour and every month) that are appropriate for CPU level interrupt. Periodic Interrupt outputs from INTR . The RS5C372B has polling function that monitors pin status in the register. 7. 32-kHz clock output RS5C372A The RS5C372A may output oscillation frequency from the INTRB pin. This clock output is set for output by default, which is set to on or off by setting the register. RS5C372B The RS5C372B may output oscillation frequency from the 32KOUT pin. This clock output is set for output by default, which is set to on or off by setting the register. The 32KOUT pin is CMOS push-pull output terminal. Note The year-digit counter of RS5C372A/B counts only lower two digits of a year and no counter is supplied for upper two digits. When you are going to use this product in a system that must cope with “2000 year problem” which shall be corrected by software. |
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