S3C44B0X

Manufacturer Part NumberS3C44B0X
DescriptionBGA
ManufacturerSamsung
S3C44B0X datasheets
 


Specifications of S3C44B0X

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S3C2400 RISC MICROPROCESSOR
REAL TIME CLOCK OPERATION
TICNT
Time Tick Generator
128 Hz
15
2
Clock Divider
XTIrtc
1 Hz
XTOrtc
Control Register
RTCCON
LEAP YEAR GENERATOR
This block can determine whether the last date of each month is 28, 29, 30, or 31, based on data from BCDDAY,
BCDMON, and BCDYEAR. This block considers the 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 is a leap year or not. For example, it can not
discriminate between 1900 and 2000. To solve this problem, the RTC block in S3C2400X01 has hard-wired logic to
support the leap year in 2000. Please note 1900 is not leap year while 2000 is leap year. Therefore, two digits of 00
in S3C2400X01 denote 2000, not 1900.
READ/WRITE REGISTERS
Bit 0 of the RTCCON register must be set to high in order to write the BCD register in RTC block. To display the
sec., min., hour, date, month, and year, the CPU should read the data in BCDSEC, BCDMIN, BCDHOUR, BCDDAY,
BCDDATE, BCDMON, and BCDYEAR registers, respectively, in the RTC block. However, a one second deviation
may exist because multiple registers are read. For example, when the user reads the registers from BCDYEAR to
BCDMIN, the result is assumed to be 2059(Year), 12(Month), 31(Date), 23(Hour) and 59(Minute). When the user
read the BCDSEC register and the result is a value from 1 to 59(Second), there is no problem, but, if the result is 0
sec., the year, month, date, hour, and minute may be changed to 2060(Year), 1(Month), 1(Date), 0(Hour) and
0(Minute) because of the one second deviation that was mentioned. In this case, user should re-read from
BCDYEAR to BCDSEC if BCDSEC is zero.
BACKUP BATTERY OPERATION
The RTC logic can be driven by the backup battery, which supplies the power through the RTCVDD pin into RTC
block, even if the system power is off. When the system off, the interfaces of the CPU and RTC logic should be
blocked, and the backup battery only drives the oscillation circuit and the BCD counters to minimize power
dissipation.
RTCRST
Reset Register
SEC
MIN
PMWKUP
Figure 17-1. Real Time Clock Block Diagram
REAL TIME CLOCK
Leap Year Generator
HOUR
DATE
DAY
MON
Alarm Generator
PWDN
ALMINT
TIME TICK
YEAR
RTCALM
17-2