UPD78F1502AGK-GAK-AX Datasheet, PDF (370/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 7 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.
Even if the second count register overflows while this register is being written, this register ignores the overflow and
is set to the value written. Set a decimal value of 00 to 59 to this register in BCD code.
MIN can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 7-8. Format of Minute Count Register (MIN)
Address: FFF93H After reset: 00H R/W
Symbol
7
6
5
MIN
0
MIN40
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 00 to 23, or 01 to 12 and 21 to 32 (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.
Even if the minute count register overflows while this register is being written, this register ignores the overflow and
is set to the value written. Set a decimal value of 00 to 23, or 01 to 12 and 21 to 32 to this register in BCD code.
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 (bit 3 of the RTCC0 register) is set to 1 after reset.
Figure 7-9. Format of Hour Count Register (HOUR)
Address: FFF94H 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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Jun 20, 2011