PCA8565 查看數據表（PDF） - Philips Electronics
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PCA8565 Datasheet PDF : 26 Pages
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Philips Semiconductors
PCA8565
Real time clock/calender
Table 14: Weekday assignments…continued
Day
Bit 7 Bit 6 Bit 5 Bit 4
Thursday
x
x
x
x
Friday
x
x
x
x
Saturday
x
x
x
x
Bit 3
x
x
x
Bit 2
1
1
1
Bit 1
0
0
1
Bit 0
0
1
0
Table 15: Months/century (address 07H) bits description
Bit
Symbol Value
Description
7
century[1]
this bit is toggled when the years register overflows from 99 to 00
0
indicates the century is 20xx
1
indicates the century is 19xx
4 to 0
month
01 to 12 this register holds the current month coded in BCD format, see Table 16
[1] These bits may be re-assigned by the user.
Table 16: Month assignments
Month
Bit 7 Bit 6
January
C
x
February
C
x
March
C
x
April
C
x
May
C
x
June
C
x
July
C
x
August
C
x
September
C
x
October
C
x
November
C
x
December
C
x
Bit 5
x
x
x
x
x
x
x
x
x
x
x
x
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
Bit 2
0
0
0
1
1
1
1
0
0
0
0
0
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
Table 17:
Bit
7 to 0
Years (address 08H) bits description
Symbol Value
Description
years
00 to 99 this register holds the current year coded in BCD format
8.6.4 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.
9397 750 10695
Product data
Rev. 01 — 31 March 2003
© Koninklijke Philips Electronics N.V. 2003. All rights reserved.
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