LPC2000 series of microcontrollers have built in Real Time Clock(RTC) unit which is may be used for counting time in order to maintain a calendar and clock. RTC is designed for low power designs that enables to use in battery powered designs. Real time clock is capable to count time in Seconds, Minutes, Hours, Days of Month, Months, Years, Days of the week and Days of Year. Real time module can be clock using distinct 32kHz clock oscillator or internal prescaller from VPB clock. Real time clock unit has additional power supply pins(3.3V) what allows RTC clock to work when system is off – actually power down mode operated from clock battery.
As there are many functions in clocks like time units(seconds, minutes, etc,) and alarms, there are quite a number of registers to cover clock functionality. There are several groups of registers:
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