LPC1850 datasheet(79/142 Pages) NXP

79 / 142 page

LPC1850_30_20_10

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Preliminary data sheet

Rev. 2.2 — 9 September 2011

79 of 142

NXP Semiconductors

LPC1850/30/20/10

32-bit ARM Cortex-M3 microcontroller

7.16.2 Digital-to-Analog Converter (DAC)

7.16.2.1

Features

• 10-bit resolution

• Integral Non-Linearity

• Differential Non-Linearity

• Monotonic by design (resistor string architecture)

• Controllable conversion speed

• Low power consumption

7.17 Peripherals in the RTC power domain

7.17.1 RTC

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 very little power when its registers are not being

accessed by the CPU, especially reduced power modes. The RTC is clocked by a

separate 32 kHz oscillator that produces a 1 Hz internal time reference and is powered by

its own power supply pin, VBAT.

7.17.1.1

Features

• Measures the passage of time to maintain a calendar and clock. Provides seconds,

minutes, hours, day of month, month, year, day of week, and day of year.

• Ultra-low power design to support battery powered systems. Less than <tbd> required

for battery operation. Uses power from the CPU power supply when it is present.

• Dedicated battery power supply pin.

• RTC power supply is isolated from the rest of the chip.

• Calibration counter allows adjustment to better than 1 sec/day with 1 sec resolution.

• Periodic interrupts can be generated from increments of any field of the time registers.

• Alarm interrupt can be generated for a specific date/time.

7.17.2 Alarm timer

The alarm timer is a 16-bit timer and counts down at 1 kHz from a preset value generating

alarms in intervals of up to 1 min. The counter triggers a status bit when it reaches 0x00

and asserts an interrupt if enabled.

The alarm timer is part of the RTC power domain and can be battery powered.

7.18 System control

7.18.1 Configuration registers (CREG)

The following settings are controlled in the configuration register block:

• BOD trip settings

• Oscillator output

• DMA-to-peripheral muxing

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