Filter
Top Products
REAL TIME CLOCK (RTC) S3C2410A
17-2
REAL TIME CLOCK OPERATION
2
15
Clock Divider
XTOrtc
XTIrtc
Control Register
SEC
Leap Year Generator
Alarm Generator
Reset Register
1 Hz
ALMINT
RTCCON
RTCALM
RTCRST
Time Tick Generator
TIME TICKTICNT
128 Hz
PMWKUP PWDN
MIN HOUR DATE DAY MON YEAR
Figure 17-1. Real Time Clock Block Diagram
LEAP YEAR GENERATOR
The leap year generator can determine the last date of each month out of 28, 29, 30, or 31, based on data from
BCDDATE, BCDMON, and BCDYEAR. This block considers leap year in deciding on the last date. An 8-bit counter
can only represent 2 BCD digits, so it cannot decide whether "00" year (the year with its last two digits zeros) is a
leap year or not. For example, it cannot discriminate between 1900 and 2000. To solve this problem, the RTC block
in S3C2410A has hard-wired logic to support the leap year in 2000. Note 1900 is not leap year while 2000 is leap
year. Therefore, two digits of 00 in S3C2410A denote 2000, not 1900.