CMS32L051 User Manual |Chapter 7 Real-Time Clock
www.mcu.com.cn 232 / 703
7.3.9 Day count register (DAY)
This is an 8-bit register that represents the daily count value from 1 to 31 (decimal). The count is
incremented by the overflow of the hour counter. The counter performs the following counts.
01 to 31 (January, March, May, July, August, October, December)
• 01 to 30 (April, June, September, November)
• 01 to 29 (February, leap year)
• 01 to 28 (February, normal 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 hour 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 31 to this register in BCD code.
The DAY register is set by an 8-bit memory manipulation instruction. After a reset signal is generated, the value
of this register becomes 01H.
Figure 7-10 Format of day count register (DAY)
Address: 0x40044F56H After reset: 01H R/W
Symbol
7 6 5 4 3 2 1
0
DAY
Note To read and write this register while the counter is running (RTCE=1), you must follow the steps described in 7.4.3
Read and write to the real-time clock counter.
To Next Page
Loading...