OM13008,598 NXP Semiconductors, OM13008,598 Datasheet - Page 274

• Manufacturer Part Number: OM13008,598
• Description: BOARD LPC XPRESSO LPC122X
• Manufacturer: NXP Semiconductors
• Series: LPCXpressor

Specifications of OM13008,598

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: 568-6642; OM13008

16.1 How to read this chapter
16.2 Basic configuration
16.3 Features
UM10441
User manual
The RTC is available on all LPC122x parts.
The input clocks to the RTC timer can be selected through the SYSCFG
register in the PMU from the dedicated RTC oscillator or the RTC peripheral clock. The
input clock must be selected before the RTC is enabled in the SYSAHBCLKCTRL register
(see
If the RTC is used in Deep-sleep or Deep power-down modes, the RTC clock source must
be one of outputs of the dedicated RTC oscillator.
The RTC is reset by POR.
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UM10441
Chapter 16: LPC122x Real-Time Clock (RTC)
Rev. 1.1 — 10 March 2011
Dedicated 32 kHz ultra low power oscillator.
Uses 1 Hz clock, delayed 1 Hz clock, 1 kHz clock, or peripheral RTC clock as inputs.
Uses 1 Hz clock to count in one second intervals.
32-bit counter.
Programmable 32-bit match/compare register.
Software maskable interrupt when counter and match registers are identical.
Table
21) and must not be changed while the RTC is running.
All information provided in this document is subject to legal disclaimers.
Rev. 1.1 — 10 March 2011
© NXP B.V. 2011. All rights reserved.
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User manual
58)
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