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參數(shù)資料
| 型號： | 935262218112 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 時(shí)鐘/數(shù)據(jù)恢復(fù)及定時(shí)提取 |
| 英文描述： | 0 TIMER(S), REAL TIME CLOCK, PDIP8 |
| 封裝： | 0.300 INCH, PLASTIC, DIP-8 |
| 文件頁數(shù)： | 2/32頁 |
| 文件大小： | 711K |
| 代理商： | 935262218112 |
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Philips Semiconductors
PCF8563
Real-time clock/calendar
Product specication
16 April 1999
10 of 30
9397 750 04855
Philips Electronics N.V. 1999. All rights reserved.
8.6.5
Alarm registers
When one or more of the alarm registers are loaded with a valid minute, hour, day or
weekday and its corresponding AE (Alarm Enable) bit is a logic 0, then that
information will be compared with the current minute, hour, day and weekday. When
all enabled comparisons rst match, the bit AF (Alarm Flag) 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 AE bit set at logic 1 will be ignored.
Table 19: Minute alarm register bits description (address 09H)
Bit
Symbol
Description
7
AE
AE = 0; minute alarm is enabled. AE = 1; minute alarm is disabled.
6 to 0 <minute alarm>
These bits represents the minute alarm information coded in BCD
format; value = 00 to 59.
Table 20: Hour alarm register bits description (address 0AH)
Bit
Symbol
Description
7
AE
AE = 0; hour alarm is enabled. AE = 1; hour alarm is disabled.
6 to 0 <hour alarm>
These bits represents the hour alarm information coded in BCD
format; value = 00 to 23.
Table 21: Day alarm register bits description (address 0BH)
Bit
Symbol
Description
7
AE
AE = 0; day alarm is enabled. AE = 1; day alarm is disabled.
6 to 0 <day alarm>
These bits represents the day alarm information coded in BCD
format; value = 01 to 31.
Table 22: Weekday alarm register bits description (address 0CH)
Bit
Symbol
Description
7
AE
AE = 0; weekday alarm is enabled.
AE = 1; weekday alarm is disabled.
6 to 0 <weekday alarm>
These bits represents the weekday alarm information
value0to6.
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