MC68HC908LJ24 Datasheet, PDF (242/464 Pages) Motorola, Inc – Microcontrollers

Freescale Semiconductor, Inc.
Real Time Clock (RTC)
12.10.9 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
0
0
HR4
HR3
HR2
HR1
HR0
Write:
Reset: 0
0
0
U
U
U
U
U
= Unimplemented
This register is write-protected; unprotect by a write sequence to RTCWE[1:0] in RTCCOMR.
Figure 12-15. Hour Register (HRR)
12.10.10 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: $004A
Read: 0
0
0
DAY4 DAY3 DAY2 DAY1
Write:
Reset: 0
0
0
U
U
U
U
= Unimplemented
This register is write-protected; unprotect by a write sequence to RTCWE[1:0] in RTCCOMR.
Figure 12-16. Day Register (DAYR)
DAY0
U
Data Sheet
242
MC68HC908LJ24/LK24 — Rev. 2
Real Time Clock (RTC)
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