UM10139

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Philips SemiconductorsVolume 1<strong>UM10139</strong>Chapter 18: D/A Converter18.4 OperationBits 19:18 of the PINSEL1 register (Section 7.4.2 “Pin function Select register 1 (PINSEL1- 0xE002 C004)” on page 77) control whether the DAC is enabled and controlling the stateof pin P0.25/AD0.4/AOUT. When these bits are 10, the DAC is powered on and active.The settling times noted in the description of the BIAS bit are valid for a capacitance loadon the A OUT pin not exceeding 100 pF. A load impedance value greater than that value willcause settling time longer than the specified time.© Koninklijke Philips Electronics N.V. 2005. All rights reserved.User manual Rev. 01 — 15 August 2005 274
<strong>UM10139</strong>Chapter 19: Real Time ClockRev. 01 — 15 August 2005User manual19.1 Features19.2 Description19.3 Architecture• 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 Dayof 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 3.3 V.The Real Time Clock (RTC) is a set of counters for measuring time when system power ison, and optionally when it is off. It uses little power in Power-down mode. On theLPC2141/2/4/6/8, the RTC can be clocked by a separate 32.768 KHz oscillator, or by aprogrammable prescale divider based on the VPB clock. Also, the RTC is powered by itsown power supply pin, V BAT , which can be connected to a battery or to the same 3.3 Vsupply used by the rest of the device.CLOCK GENERATORCLK32kMUXRTC OSCILLATORREFERENCE CLOCKDIVIDER (PRESCALER)CLK1CCLKStrobeTIMECOUNTERSCOMPARATORSALARMREGISTERSCounterenablesCOUNTER INCREMENTINTERRUPT ENABLEALARM MASKREGISTERINTERRUPT GENERATORFig 61. RTC block diagram© Koninklijke Philips Electronics N.V. 2005. All rights reserved.User manual Rev. 01 — 15 August 2005 275
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UM10139

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