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BQ4285P-SB2 Datasheet(PDF) 11 Page - Texas Instruments |
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BQ4285P-SB2 Datasheet(HTML) 11 Page - Texas Instruments |
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11 / 27 page  11 Register C Register C Bits 7654 3 210 INTF PF AF UF 0 0 0 0 Register C is the read-only event status register. Bits 0–3 - Unused Bits 7654 3 210 ---- 0 0 0 0 These bits are always set to 0. UF - Update-Event Flag 7654 3 210 --- UF - --- This bit is set toa1attheendofthe update cycle. Reading register C clears this bit. AF - Alarm Event Flag 7654 3 210 -- AF - - --- This bit is set to a 1 when an alarm event occurs. Read- ing register C clears this bit. 7654 3 210 -PF- - - - - - PF - Periodic Event Flag This bit is set to a 1 every tPI time, where tPI is the time period selected by the settings of RS0–RS3 in register A. Reading register C clears this bit. INTF - Interrupt Request Flag 7654 3 210 INTF - - - - - - - This flag is set to a 1 when any of the following is true: AIE = 1 and AF = 1 PIE = 1 and PF = 1 UIE = 1 and UF = 1 Reading register C clears this bit. Register D Register D Bits 7654 3 210 VRT 000 0 000 Register D is the read-only data integrity status regis- ter. Bits 0–6 - Unused Bits 7654 3 210 - 000 0 000 These bits are always set to 0. VRT - Valid RAM and Time 7654 3 210 VRT --- - --- 1 = Valid backup energy source 0 = Backup energy source is depleted When the backup energy source is depleted (VRT = 0), data integrity of the RTC and storage registers is not guaranteed. bq4285 |
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