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LPC1850 Datasheet(PDF) 77 Page - NXP Semiconductors |
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LPC1850 Datasheet(HTML) 77 Page - NXP Semiconductors |
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77 / 84 page  LPC1850_30_20_10 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2011. All rights reserved. Objective data sheet Rev. 1 — 3 January 2011 77 of 84 NXP Semiconductors LPC1850/30/20/10 32-bit ARM Cortex-M3 microcontroller 13.2 XTAL1 input The input voltage to the on-chip oscillators is limited to 1.2 V. If the oscillator is driven by a clock in slave mode, it is recommended that the input be coupled through a capacitor with Ci = 100 pF. To limit the input voltage to the specified range, choose an additional capacitor to ground Cg which attenuates the input voltage by a factor Ci/(Ci + Cg). In slave mode, a minimum of 200 mV (RMS) is needed. For more details see <tbd>. 13.3 XTAL and RTCX Printed Circuit Board (PCB) layout guidelines The crystal should be connected on the PCB as close as possible to the oscillator input and output pins of the chip. Take care that the load capacitors Cx1, Cx2, and Cx3 in case of third overtone crystal usage have a common ground plane. The external components must also be connected to the ground plain. Loops must be made as small as possible in order to keep the noise coupled in via the PCB as small as possible. Also parasitics should stay as small as possible. Values of Cx1 and Cx2 should be chosen smaller accordingly to the increase in parasitics of the PCB layout. LCDVD0 - - - - - - P4_1 RED0 LCDLP P7_6 LCDLP P7_6 LCDLP P7_6 LCDLP P7_6 LCDLP LCDENAB/ LCDM P4_6 LCDENAB/ LCDM P4_6 LCDENAB/ LCDM P4_6 LCDENAB/ LCDM P4_6 LCDENAB/ LCDM LCDFP P4_5 LCDFP P4_5 LCDFP P4_5 LCDFP P4_5 LCDFP LCDDCLK P4_7 LCDDCLK P4_7 LCDDCLK P4_7 LCDDCLK P4_7 LCDDCLK LCDLE P7_0 LCDLE P7_0 LCDLE P7_0 LCDLE P7_0 LCDLE LCDPWR P7_7 LCDPWR P7_7 LCDPWR P7_7 LCDPWR P7_7 LCDPWR GP_CLKIN PF_4 LCDCLKIN PF_4 LCDCLKIN PF_4 LCDCLKIN PF_4 LCDCLKIN Table 21. LCD panel connections for TFT panels External pin TFT 12 bit (4:4:4 mode) TFT 16 bit (5:6:5 mode) TFT 16 bit (1:5:5:5 mode) TFT 24 bit LPC18xx pin used LCD function LPC18xx pin used LCD function LPC18xx pin used LCD function LPC18xx pin used LCD function Fig 25. Slave mode operation of the on-chip oscillator LPC1xxx XTAL1 Ci 100 pF Cg 002aae835 |
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