CHAPTER 9 REAL-TIME CLOCK
Page 244 of 920
9.3.5
The SEC register is an 8-bit register that takes a value of 0 to 59 (decimal) and indicates the count value of
seconds.
It counts up when the internal counter (16-bit) overflows.
When data is written to this register, it is written to a buffer and then to the counter up to two cycles of f
RTC
later.
Set a decimal value of 00 to 59 to this register in BCD code.
The SEC register can be set by an 8-bit memory manipulation instruction.
Reset signal generation clears this register to 00H.
Figure 9 - 7 Format of Second count register (SEC)
Caution
When it reads or writes from/to the register while the counter is in operation (RTCE = 1), follow the
procedures described in the section 9.4.3 Reading/writing real-time clock.
Remark
The internal counter (16 bits) is cleared when the second count register (SEC) is written.
9.3.6
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 two cycles of f
RTC
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.
The MIN register 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)
Caution
When it reads or writes from/to the register while the counter is in operation (RTCE = 1), follow the
procedures described in the section 9.4.3 Reading/writing real-time clock.
Address: FFF92H
After reset: 00H
Symbol
7
6
5
4
3
2
1
0
0
SEC40
SEC20
SEC10
SEC8
SEC4
SEC2
SEC1
Address: FFF93H
After reset: 00H
Symbol
7
6
5
4
3
2
1
0
0
MIN40
MIN20
MIN10
MIN8
MIN4
MIN2
MIN1
Содержание RL78/G1H
Страница 941: ...R01UH0575EJ0120 RL78 G1H...