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PCA8565 Datasheet PDF : 39 Pages
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NXP Semiconductors
PCA8565
Real time clock/calendar
9.3 Reset
The PCA8565 includes an internal reset circuit which is active whenever the oscillator is
stopped. In the reset state the I2C-bus logic is initialized including the address pointer. All
other registers are set according to Table 7.
Table 7. Register reset values[1]
Address Register name Bit
7
6
5
4
3
2
1
0
00h
Control_1
0
0
0
0
1
0
0
0
01h
Control_2
x
x
0
0
0
0
0
0
02h
Seconds
1
x
x
x
x
x
x
x
03h
Minutes
1
x
x
x
x
x
x
x
04h
Hours
x
x
x
x
x
x
x
x
05h
Days
x
x
x
x
x
x
x
x
06h
Weekdays
x
x
x
x
x
x
x
x
07h
Months_century x
x
x
x
x
x
x
x
08h
Years
x
x
x
x
x
x
x
x
09h
Minute_alarm
1
x
x
x
x
x
x
x
0Ah
Hour_alarm
1
x
x
x
x
x
x
x
0Bh
Day_alarm
1
x
x
x
x
x
x
x
0Ch
Weekday_alarm 1
x
x
x
x
x
x
x
0Dh
CLKOUT_control 1
x
x
x
x
x
0
0
0Eh
Timer_control
0
x
x
x
x
x
1
1
0Fh
Timer
x
x
x
x
x
x
x
x
[1] Registers labeled ‘x’ are undefined at power-on and unchanged by subsequent resets.
9.4 Time and date registers
The majority of the registers are coded in the BCD format to simplify application use.
Table 8. Register Seconds (address 02h) bits description
Bit Symbol Value Place value Description
7
VL
0
-
clock integrity is guaranteed
1[1]
-
integrity of the clock information is not guaranteed
6 to 4 SECONDS 0 to 5[2] ten’s place actual seconds coded in BCD format
3 to 0
0 to 9[2] unit place
[1] Start-up value.
[2] Values shown in decimal.
PCA8565_2
Product data sheet
Rev. 02 — 16 June 2009
© NXP B.V. 2009. All rights reserved.
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