UPD78F0411GA-GAM-AX Datasheet, PDF (274/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 9 REAL-TIME COUNTER
(11) Month count register (MONTH)
The MONTH register is an 8-bit register that takes a value of 1 to 12 (decimal) and indicates the count value
of months.
It counts up when the day counter overflows.
When data is written to this register, it is written to a buffer and then to the counter up to 2 clocks (32.768 kHz)
later. Set a decimal value of 01 to 12 to this register in BCD code. If a value outside this range is set, the
register value returns to the normal value after 1 period.
MONTH can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 01H.
Figure 9-12. Format of Month Count Register (MONTH)
Address: FF67H After reset: 01H R/W
Symbol
7
6
5
MONTH
0
0
0
4
MONTH10
3
MONTH8
2
MONTH4
1
MONTH2
0
MONTH1
(12) Year count register (YEAR)
The YEAR register is an 8-bit register that takes a value of 0 to 99 (decimal) and indicates the count value of
years.
It counts up when the month counter overflows.
Values 00, 04, 08, …, 92, and 96 indicate a leap year.
When data is written to this register, it is written to a buffer and then to the counter up to 2 clocks (32.768 kHz)
later. Set a decimal value of 00 to 99 to this register in BCD code. If a value outside this range is set, the
register value returns to the normal value after 1 period.
YEAR can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 9-13. Format of Year Count Register (YEAR)
Address: FF68H After reset: 00H R/W
Symbol
7
6
5
YEAR
YEAR80
YEAR40
YEAR20
4
YEAR10
3
YEAR8
2
YEAR4
1
YEAR2
0
YEAR1
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User’s Manual U18698EJ1V0UD