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REAL TIME CLOCK
S3C2416X RISC MICROPROCESSOR
13-2
1.2 REAL TIME CLOCK OPERATION DESCRIPTION
2
15
Clock
Divider
XTOrtc
XTIrtc
Control
Register
SEC
MIN
HOUR
DATE
DAY
MON
YEAR
Leap Year Generator
Alarm Generator
Reset
Register
1 Hz
ALMINT
RTCCON
RTCALM
RTCRST
Time Tick Generator
TICWKUP
TICNT
32KHz~1Hz
ALMWKUP
TICINT
Figure 13-1. Real Time Clock Block Diagram
1.2.1 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
BCDDAY, BCDMON, and BCDYEAR. This block considers leap year in deciding on the last date. An 8-bit counter
can only represent 2 BCD digits, therefore 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 S3C2416 has hard-wired logic to support the leap year in 2000. Note 1900 is not leap year while
2000 is leap year in general Gregorian calendar. Therefore, two digits of 00 in S3C2416 denote 2000, not 1900.
So, RTC in S3C2416 supports from 1901 to 2099.
Summary of Contents for S3C2416
Page 122: ...BUS MATRIX EBI S3C2416X RISC MICROPROCESSOR 3 4 NOTES ...
Page 204: ...DMA CONTROLLER S3C2416X RISC MICROPROCESSOR 8 18 NOTES ...
Page 284: ...WATCHDOG TIMER S3C2416X RISC MICROPROCESSOR 11 6 NOTES ...
Page 320: ...REAL TIME CLOCK S3C2416X RISC MICROPROCESSOR 13 16 NOTES ...
Page 344: ...UART S3C2416X RISC MICROPROCESSOR 14 24 NOTES ...
Page 380: ...USB2 0 DEVICE S3C2416X RISC MICROPROCESSOR 16 34 NOTES ...
Page 432: ...2D S3C2416X RISC MICROPROCESSOR 18 38 NOTES ...
Page 446: ...HS_SPI CONTROLLER S3C2416X RISC MICROPROCESSOR 19 14 NOTES ...
Page 604: ...S3C2416X RISC MICROPROCESSOR S3C2416X RISC MICROPROCESSOR 23 22 NOTES ...
Page 638: ...PCM AUDIO INTERFACE S3C2416X RISC MICROPROCESSOR 25 18 NOTES ...
Page 670: ...ELECTRICAL DATA S3C2416X RISC MICROPROCESSOR 26 32 NOTES ...