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BQ3285LDSSTR Datasheet(PDF) 9 Page - Texas Instruments |
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BQ3285LDSSTR Datasheet(HTML) 9 Page - Texas Instruments |
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9 / 28 page  UIP - Update Cycle Status This read-only bit is set prior to the update cycle. When UIP equals 1, an RTC update cycle may be in progress. UIP is cleared at the end of each update cycle. This bit is also cleared when the update transfer inhibit (UTI) bit in register B is 1. Register B Register B enables: n Update cycle transfer operation n Interrupt events n Daylight saving adjustment Register B selects: n Clock and calendar data formats All bits of register B are read/write. Bit 3 - Unused Bit. DSE - Daylight Saving Enable This bit enables daylight-saving time adjustments when written to 1: n On the last Sunday in October, the first time the bq3285ED/LD increments past 1:59:59 AM, the time falls back to 1:00:00 AM. n On the first Sunday in April, the time springs forward from 2:00:00 AM to 3:00:00 AM. HF - Hour Format This bit selects the time-of-day and alarm hour format: 1 = 24-hour format 0 = 12-hour format DF - Data Format This bit selects the numeric format in which the time, alarm, and calendar bytes are represented: 1 = Binary 0 = BCD UIE - Update Cycle Interrupt Enable This bit enables an interrupt request due to an update ended interrupt event: 1 = Enabled 0 = Disabled The UIE bit is automatically cleared when the UTI bit equals 1. AIE - Alarm Interrupt Enable This bit enables an interrupt request due to an alarm interrupt event: 1 = Enabled 0 = Disabled PIE - Periodic Interrupt Enable This bit enables an interrupt request due to a periodic interrupt event: 1 = Enabled 0 = Disabled UTI - Update Transfer Inhibit 9 bq3285ED/LD 7654 3 210 ---- - - - DSE 7654 3 210 ---- - - HF - 7654 3 210 ---- - DF - - 7654 3 210 --- UIE - --- Register B Bits 7654 3 210 UTI PIE AIE UIE - DF HF DSE 7654 3 210 -- AIE - - --- 7654 3 210 - PIE -- - --- July 1997 7654 3 210 UTI --- - --- 76543210 UIP ------- |
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