PCA8565TS Philips Semiconductors, PCA8565TS Datasheet - Page 8

• Manufacturer Part Number: PCA8565TS
• Description: Real time clock/calender
• Manufacturer: Philips Semiconductors

Philips Semiconductors
Table 15:
[1]
Table 17:
9397 750 10695
Product data
Bit
7
4 to 0
Bit
7 to 0
These bits may be re-assigned by the user.
Months/century (address 07H) bits description
Years (address 08H) bits description
Symbol
month
Symbol
years
century
[1]
8.6.4 Alarm registers
Value
0
1
01 to 12
Value
00 to 99
Table 14:
Table 16:
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.
Day
Thursday
Friday
Saturday
Month
January
February
March
April
May
June
July
August
September
October
November
December
Description
this bit is toggled when the years register overflows from 99 to 00
indicates the century is 20xx
indicates the century is 19xx
this register holds the current month coded in BCD format, see
Description
this register holds the current year coded in BCD format
Weekday assignments
Month assignments
Bit 7
x
x
x
Bit 7
C
C
C
C
C
C
C
C
C
C
C
C
Rev. 01 — 31 March 2003
Bit 6
x
x
Bit 6
x
x
x
x
x
x
x
x
x
x
x
x
x
…continued
Bit 5
x
x
x
Bit 5
x
x
x
x
x
x
x
x
x
x
x
x
Bit 4
x
x
x
Bit 4
0
0
0
0
0
0
0
0
0
1
1
1
Bit 3
x
x
x
Bit 3
0
0
0
0
0
0
0
1
1
0
0
0
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
Real time clock/calender
Bit 2
1
1
1
Bit 2
0
0
0
1
1
1
1
0
0
0
0
0
PCA8565
Table 16
Bit 1
0
0
1
Bit 1
0
1
1
0
0
1
1
0
0
0
0
1
Bit 0
0
1
0
Bit 0
1
0
1
0
1
0
1
0
1
0
1
0
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