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PCF8563 Datasheet(PDF) 9 Page - NXP Semiconductors |
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PCF8563 Datasheet(HTML) 9 Page - NXP Semiconductors |
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9 / 32 page  PCF8563_6 © NXP B.V. 2008. All rights reserved. Product data sheet Rev. 06 — 21 February 2008 9 of 32 NXP Semiconductors PCF8563 Real-time clock/calendar 7.6.4 Alarm registers When one or more of these registers are loaded with a valid minute, hour, day or weekday and its corresponding bit Alarm Enable (AE) is logic 0, then that information will be compared with the current minute, hour, day and weekday. When all enabled comparisons first match, the Alarm Flag (AF) is set. AF will remain set until cleared by software. Once AF has been cleared it will only be set again when the time increments to match the alarm condition once more. Alarm registers which have their bit AE at logic 1 will be ignored. Table 14. Month assignments Month Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0 January C x x 00001 February C x x 00010 March C x x 00011 April C x x 00100 May C x x 00101 June C x x 00110 July C x x 00111 August C x x 01000 September C x x 01001 October C x x 10000 November C x x 10001 December C x x 10010 Table 15. Years - Years register (address 08h) bit description Bit Symbol Value Description 7 to 0 YEARS[7:0] 00 to 99 the current year, coded in BCD format Table 16. Minute_alarm - Minute alarm register (address 09h) bit description Bit Symbol Value Description 7 AE 0 minute alarm is enabled 1 minute alarm is disabled 6 to 0 ALARM _MINUTES[6:0] 00 to 59 the minute alarm information, coded in BCD format Table 17. Hour_alarm - Hour alarm register (address 0Ah) bit description Bit Symbol Value Description 7 AE 0 hour alarm is enabled 1 hour alarm is disabled 6 x not relevant 5 to 0 ALARM_HOURS[5:0] 00 to 23 the hour alarm information, coded in BCD format |
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