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PCF8563 bảng dữ liệu(PDF) 9 Page - NXP Semiconductors

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PCF8563 bảng dữ liệu(HTML) 9 Page - NXP Semiconductors

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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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