Datasheet

PCA8565 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2014. All rights reserved.
Product data sheet Rev. 4 — 5 December 2014 6 of 48
NXP Semiconductors
PCA8565
Real time clock/calendar
8.1 Register overview
Table 5. Register overview and control bits default values
Bit positions labeled as - are not implemented. Bit positions labeled as N should always be written with logic 0. Reset values
are shown in Table 8.
Address Register name Bit
7 6 5 4 3 2 1 0
Control registers
00h Control_1 TEST1 N STOP N TESTC N N N
01h Control_2 NNNTI_TPAFTFAIETIE
Time and date registers
02h Seconds VL SECONDS (0 to 59)
03h Minutes - MINUTES (0 to 59)
04h Hours - - HOURS (0 to 23)
05h Days - - DAYS (1 to 31)
06h Weekdays -----WEEKDAYS (0 to 6)
07h Months_century C - - MONTHS (1 to 12)
08h Years YEARS (0 to 99)
Alarm registers
09h Minute_alarm AE_M MINUTE_ALARM (0 to 59)
0Ah Hour_alarm AE_H - HOUR_ALARM (0 to 23)
0Bh Day_alarm AE_D - DAY_ALARM (1 to 31)
0Ch Weekday_alarmAE_W----WEEKDAY_ALARM (0 to 6)
CLKOUT control register
0Dh CLKOUT_controlFE-----FD
Timer registers
0Eh Timer_controlTE-----TD
0Fh Timer COUNTDOWN_TIMER