S3C44B0X

Manufacturer Part NumberS3C44B0X
DescriptionBGA
ManufacturerSamsung
S3C44B0X datasheets
 

Specifications of S3C44B0X

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S3C2400 RISC MICROPROCESSOR
ALARM FUNCTION
The RTC generates an alarm signal at a specified time in the power down mode or normal operation mode. In normal
operation mode, the alarm interrupt (ALMINT) is activated. In the power down mode the power management wakeup
(PMWKUP) signal is activated as well as the ALMINT. The RTC alarm register, RTCALM, determines the alarm
enable/disable and the condition of the alarm time setting.
TICK TIME INTERRUPT
The RTC tick time is used for interrupt request. The TICNT register has an interrupt enable bit and the count value for
the interrupt. The count value reaches '0' when the tick time interrupt occurs. Then the period of interrupt is as follow:
Period = ( n+1 ) / 128 second
n: Tick time count value (1–127)
This RTC time tick may be used for RTOS(real time operating system) kernel time tick. If time tick is generated by
RTC time tick, the time related function of RTOS will always synchronized with real time.
ROUND RESET FUNCTION
The round reset function can be performed by the RTC round reset register, RTCRST. The round boundary (30, 40, or
50 sec) of the second carry generation can be selected, and the second value is rounded to zero in the round reset.
For example, when the current time is 23:37:47 and the round boundary is selected to 40 sec, the round reset
changes the current time to 23:38:00.
All RTC registers have to be accessed by the byte unit using the STRB,LDRB instructions or char type
pointer.
32.768 KHZ X-TAL CONNECTION EXAMPLE
The Figure 17-2 is an example circuit of the RTC unit oscillation at 32.768 kHz.
NOTE
15 22pF
XTIrtc
32768 Hz
XTOrtc
Figure 17-2. Main Oscillator Circuit Examples
REAL TIME CLOCK
17-3