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Renesas rl78 User Manual

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RL78/G1A 
 
CHAPTER  7   REAL-TIME  CLOCK 
7.3.10  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 two cycles of f
RTC
 later.  Even if 
the day 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 01 to 12 to this register in BCD code.  
<R> 
The MONTH register can be set by an 8-bit memory manipulation instruction. 
Reset signal generation clears this register to 01H. 
 
Figure 7-11.  Format of Month Count Register (MONTH) 
 
Address: FFF97H     After reset: 01H     R/W 
Symbol 
7 6 5 4 3 2 1 0 
MONTH 
0 
0 
0 
MONTH10
MONTH8 MONTH4 MONTH2 MONTH1 
 
Caution  When it reads or writes from/to the register while the counter is in operation (RTCE = 1), follow 
the procedures described in 7.4.3  Reading/writing real-time clock. 
 
7.3.11  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 count register (MONTH) 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 two cycles of f
RTC
 later.  Even if 
the MONTH 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 99 to this register in BCD code.  
<R> 
The YEAR register can be set by an 8-bit memory manipulation instruction. 
Reset signal generation clears this register to 00H. 
 
Figure 7-12.  Format of Year Count Register (YEAR) 
 
Address: FFF98H     After reset: 00H     R/W 
Symbol 
7 6 5 4 3 2 1 0 
YEAR  YEAR80 YEAR40 YEAR20 YEAR10  YEAR8  YEAR4  YEAR2  YEAR1 
 
Caution  When it reads or writes from/to the register while the counter is in operation (RTCE = 1), follow 
the procedures described in 7.4.3  Reading/writing real-time clock. 
 
 
R01UH0305EJ0200  Rev.2.00 
 
 
306  
Jul 04, 2013