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PCF8523T/1 数据表(PDF) 24 Page - NXP Semiconductors |
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PCF8523T/1 数据表(HTML) 24 Page - NXP Semiconductors |
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24 / 75 page  PCF8523 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved. Product data sheet Rev. 4 — 5 July 2012 24 of 74 NXP Semiconductors PCF8523 Real-Time Clock (RTC) and calendar Because of this method, it is very important to make a read or write access in one go, that is, setting or reading seconds through to years should be made in one single access. Failing to comply with this method could result in the time becoming corrupted. As an example, if the time (seconds through to hours) is set in one access and then in a second access the date is set, it is possible that the time will increment between the two accesses. A similar problem exists when reading. A rollover may occur between reads thus giving the minutes from one moment and the hours from the next. 8.7 Alarm registers The registers at addresses 0Ah through 0Dh contain the alarm information. 8.7.1 Register Minute_alarm [1] Default value. 8.7.2 Register Hour_alarm [1] Default value. [2] Hour mode is set by bit 12_24 in register Control_1 (see Table 7). Table 22. Minute_alarm - minute alarm register (address 0Ah) bit description Bit Symbol Value Place value Description 7 AE_M 0 - minute alarm is enabled 1[1] - minute alarm is disabled 6 to 4 MINUTE_ALARM 0 to 5 ten’s place minute alarm information coded in BCD format 3 to 0 0 to 9 unit place Table 23. Hour_alarm - hour alarm register (address 0Bh) bit description Bit Symbol Value Place value Description 7 AE_H 0 - hour alarm is enabled 1[1] - hour alarm is disabled 6 - - - unused 12 hour mode[2] 5 AMPM 0 - indicates AM 1 - indicates PM 4 HOUR_ALARM 0 to 1 ten’s place hour alarm information in 12 hour mode coded in BCD format 3 to 0 0 to 9 unit place 24 hour mode[2] 5 to 4 HOURS 0 to 2 ten’s place hour alarm information in 24 hour mode coded in BCD format 3to0 0to 9 unit place |
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