LPC2131/2132/2138 User Manual - mct.net

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Philips Semiconductors Preliminary User Manual ARM-based Microcontroller LPC2131/2132/2138 D/A Converter (LPC2132/2138 only) 204 November 22, 2004
Philips Semiconductors Preliminary User Manual ARM-based Microcontroller 18. REAL TIME CLOCK FEATURES Measures the passage of time to maintain a calendar and clock. Ultra Low Power design to support battery powered systems. Provides Seconds, Minutes, Hours, Day of Month, Month, Year, Day of Week, and Day of Year. Dedicated 32 KHz oscillator or programmable prescaler from VPB clock. Dedicated power supply pin can be connected to a battery or to the main 3.3V. DESCRIPTION LPC2131/2132/2138 The Real Time Clock (RTC) is a set of counters for measuring time when system power is on, and optionally when it is off. It uses little power in power down mode. On the LPC2131/2132/2138, the RTC can be clocked by a separate 32.768 KHz oscillator, or by a programmable prescale divider based on the VPB clock. Also, the RTC is powered by its own power supply pin, V bat, which can be connected to a battery or to the same 3.3 volt supply used by the rest of the device. Real Time Clock 205 November 22, 2004
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Philips Semiconductors INTEGRATED C
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