MC68HC908LJ12 Datasheet, PDF (224/413 Pages) Freescale Semiconductor, Inc – 8-bit microcontroller units

Real Time Clock (RTC)
12.6.9 Month Register (MTHR)
This read/write register contains the current value of the month counter.
This register can be read at any time without affecting the counter count.
Writing to this register loads the value to the month counter and the
counter continues to count from this new value.
The month counter rolls over to 1 ($01) after reaching 12 ($0B). Writing
a value other than 1 to 12 to this register has no effect.
Address: $004B
Read: 0
Write:
Reset: 0
0
0
0
0
= Unimplemented
0
MTH3 MTH2 MTH1
0
0
0
0
Figure 12-12. Month Register (MTHR)
MTH0
1
12.6.10 Year Register (YRR)
This read/write register contains the current value of the year counter.
This register can be read at any time without affecting the counter count.
Writing to this register loads the value to the year counter and the
counter continues to count from this new value.
The value stored in this register is a two’s complement representation of
the year, relative to 2000. For example, the year 2008 is represented
by 8 ($08), and the year 1979 is presented by –11 ($F5). The range of
this register is only valid for –99 to +99. Writing a value other than –99
to +99 to this register has no effect.
Address: $004C
Read:
YR7
YR6
YR5
YR4
YR3
YR2
YR1
YR0
Write:
Reset: 0
0
0
0
0
0
0
0
Figure 12-13. Year Register (YRR)
MC68HC908LJ12 — Rev. 2.1
Freescale Semiconductor
Real Time Clock (RTC)
Technical Data
225