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PCA8565 Datasheet(PDF) 13 Page - NXP Semiconductors |
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PCA8565 Datasheet(HTML) 13 Page - NXP Semiconductors |
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13 / 39 page  PCA8565_2 © NXP B.V. 2009. All rights reserved. Product data sheet Rev. 02 — 16 June 2009 13 of 39 NXP Semiconductors PCA8565 Real time clock/calendar 9.6.1 Alarm registers [1] Default value. [2] Values shown in decimal. [1] Default value. [2] Values shown in decimal. [1] Default value. [2] Values shown in decimal. [1] Default value. [2] Values shown in decimal. 9.6.2 Alarm flag When all enabled comparisons first match, the Alarm Flag (AF) is set. AF will remain set until cleared using the interface. Once AF has been cleared it is only set again when the time increments to match the alarm condition once more. Table 18. Register Minute_alarm (address 09h) bits 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[2] ten’s place minute alarm information coded in BCD format 3 to 0 0 to 9[2] unit place Table 19. Register Hour_alarm (address 0Ah) bits description Bit Symbol Value Place value Description 7 AE_H 0 - hour alarm is enabled 1[1] - hour alarm is disabled 6 - - - unused 5 to 4 HOUR_ALARM 0 to 2[2] ten’s place hour alarm information coded in BCD format 3 to 0 0 to 9[2] unit place Table 20. Register Day_alarm (address 0Bh) bits description Bit Symbol Value Place value Description 7 AE_D 0 - day alarm is enabled 1[1] - day alarm is disabled 6 - - - unused 5 to 4 DAY_ALARM 0 to 3[2] ten’s place day alarm information coded in BCD format 3 to 0 0 to 9[2] unit place Table 21. Register Weekday_alarm (address 0Ch) bits description Bit Symbol Value Description 7 AE_W 0 weekday alarm is enabled 1[1] weekday alarm is disabled 6 to 3 - - unused 2 to 0 WEEKDAY_ALARM 0 to 6[2] weekday alarm information coded in BCD format |
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