NXP Semiconductors LPC1311 User Manual

UM10375 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved.
User manual Rev. 3 — 14 June 2011 21 of 368
NXP Semiconductors
UM10375
Chapter 3: LPC13xx System configuration
3.5.9 Internal resonant crystal control register
This register is used to trim the on-chip 12 MHz oscillator. The trim value is factory-preset
and written by the boot code on start-up.
8:5 FREQSEL Select watchdog oscillator analog output frequency
(Fclkana).
0x00
0x1 0.5 MHz
0x2 0.8 MHz
0x3 1.1 MHz
0x4 1.4 MHz
0x5 1.6 MHz
0x6 1.8 MHz
0x7 2.0 MHz
0x8 2.2 MHz
0x9 2.4 MHz
0xA 2.6 MHz
0xB 2.7 MHz
0xC 2.9 MHz
0xD 3.1 MHz
0xE 3.2 MHz
0xF 3.4 MHz
31:9 - - Reserved 0x00
Table 15. Watchdog oscillator control register (WDTOSCCTRL, address 0x4004 8024) bit
description
Bit Symbol Value Description Reset
value
Table 16. Internal resonant crystal control register (IRCCTRL, address 0x4004 8028) bit
description
Bit Symbol Description Reset value
7:0 TRIM Trim value 0x1000 0000, then flash will reprogram
31:8 - Reserved 0x00

NXP Semiconductors LPC1311 Specifications

General

Brand	NXP Semiconductors
Model	LPC1311
Category	Controller
Language	English