PCF8563BS NXP [NXP Semiconductors], PCF8563BS Datasheet - Page 9

• Manufacturer Part Number: PCF8563BS
• Description: Real-time clock/calendar
• Manufacturer: NXP [NXP Semiconductors]

NXP Semiconductors
PCF8563_6
Product data sheet
7.6.4 Alarm registers
Table 14.
Table 15.
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 16.
Table 17.
Month
January
February
March
April
May
June
July
August
September
October
November
December
Bit
7 to 0
Bit
7
6 to 0
Bit
7
6
5 to 0
Symbol
YEARS[7:0]
Symbol
AE
ALARM _MINUTES[6:0] 00 to 59
Symbol
AE
x
ALARM_HOURS[5:0]
Month assignments
Years - Years register (address 08h) bit description
Minute_alarm - Minute alarm register (address 09h) bit description
Hour_alarm - Hour alarm register (address 0Ah) bit description
Bit 7
C
C
C
C
C
C
C
C
C
C
C
C
Rev. 06 — 21 February 2008
Bit 6
x
x
x
x
x
x
x
x
x
x
x
x
Value
00 to 99
Value
0
1
Value
0
1
00 to 23
Bit 5
x
x
x
x
x
x
x
x
x
x
x
x
Description
the current year, coded in BCD format
Description
minute alarm is enabled
minute alarm is disabled
the minute alarm information, coded in BCD
format
Description
hour alarm is enabled
hour alarm is disabled
not relevant
the hour alarm information, coded in BCD format
Bit 4
0
0
0
0
0
0
0
0
0
1
1
1
Bit 3
0
0
0
0
0
0
0
1
1
0
0
0
Real-time clock/calendar
Bit 2
0
0
0
1
1
1
1
0
0
0
0
0
PCF8563
© NXP B.V. 2008. All rights reserved.
Bit 1
0
1
1
0
0
1
1
0
0
0
0
1
Bit 0
1
0
1
0
1
0
1
0
1
0
1
0
9 of 32