MC68HC908LJ12 Datasheet, PDF (223/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Real Time Clock (RTC)
12.6.7 Hour Register (HRR)
This read/write register contains the current value of the hour counter.
This register can be read at any time without affecting the counter count.
Writing to this register loads the value to the hour counter and the
counter continues to count from this new value.
The hour counter rolls over to 0 ($00) after reaching 23 ($17). Writing a
value other than 0 to 23 to this register has no effect.
Address: $0049
Read: 0
Write:
Reset: 0
0
0
0
0
= Unimplemented
HR4
HR3
HR2
HR1
HR0
0
0
0
0
0
Figure 12-10. Hour Register (HRR)
12.6.8 Day Register (DAYR)
This read/write register contains the current value of the day-of-month
counter. This register can be read at any time without affecting the
counter count. Writing to this register loads the value to the day counter
and the counter continues to count from this new value.
The day counter rolls over to 1 ($01) after reaching 28 ($1B), 29 ($1C),
30 ($1D), or 31 ($1E), depending on the value in the month and year
registers. Writing a value that is not valid for the month and year to this
register has no effect.
Address:
Read:
Write:
Reset:
$004A
0
0
0
0
0
0
= Unimplemented
DAY4 DAY3 DAY2
0
0
0
Figure 12-11. Day Register (DAYR)
DAY1
0
DAY0
1
Technical Data
224
Real Time Clock (RTC)
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor