UPD78F0411GA-GAM-AX Datasheet, PDF (272/564 Pages) Renesas Technology Corp – Old Company Name in Catalogs and Other Documents

CHAPTER 9 REAL-TIME COUNTER
(7) Minute count register (MIN)
The MIN register is an 8-bit register that takes a value of 0 to 59 (decimal) and indicates the count value of
minutes.
It counts up when the second 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 00 to 59 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.
MIN can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 9-8. Format of Minute Count Register (MIN)
Address: FF63H After reset: 00H R/W
Symbol
7
6
MIN
0
MIN40
5
MIN20
4
MIN10
3
MIN8
2
MIN4
1
MIN2
0
MIN1
(8) Hour count register (HOUR)
The HOUR register is an 8-bit register that takes a value of 0 to 23 or 1 to 12 (decimal) and indicates the count
value of hours.
It counts up when the minute 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 00 to 23, 01 to 12, or 21 to 32 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.
HOUR can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 12H.
However, the value of this register is 00H if the AMPM bit is set to 1 after reset.
Figure 9-9. Format of Hour Count Register (HOUR)
Address: FF64H After reset: 12H R/W
Symbol
7
6
5
HOUR
0
0
HOUR20
4
HOUR10
3
HOUR8
2
HOUR4
1
HOUR2
0
HOUR1
Caution Bit 5 (HOUR20) of HOUR indicates AM(0)/PM(1) if AMPM = 0 (if the 12-hour system is
selected).
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User’s Manual U18698EJ1V0UD