S3C3410X Datasheet, PDF (291/314 Pages) Samsung semiconductor – 16-Bit CMOS Microcontrollers

S3C3410X RISC MICROPROCESSOR
REAL TIME CLOCK
16 RTC (REAL TIME CLOCK)
OVERVIEW
The RTC(Real Time Clock) unit can be operated by the backup battery although the system power is turned off.
The RTC can transmit 8-bit data to CPU as BCD(Binary Coded Decimal) values using STRB/LDRB ARM
operation. The data include second, minute, hour, date, day, month, and year. The RTC unit works with an
external 32.768KHz crystal and also can perform the alarm function
FEATURE
• BCD number: second, minute, hour, date, day, month, year
• Leap year generator
• Alarm function: alarm interrupt.
• Year 2000 problem is removed.
• Independent power pin (RTCVDD)
• RTC Time interrupt (SEC/MIN/HOUR)
REAL TIME CLOCK OPERATION
EXTAL1
XTAL1
OSC & Frequency
Division Logic
Leap Year Generator
SEC
MIN HOUR DAY DATE MON YEAR
INT_RTCT
RTCCON
Alarm Generator
SYSTEM BUS
Figure 16-1. Real Time Clock Block Diagram
INT_RTCA
16-1