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LPC18S50 Datasheet(PDF) 131 Page - NXP Semiconductors |
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LPC18S50 Datasheet(HTML) 131 Page - NXP Semiconductors |
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131 / 151 page  LPC18S50_S30_S10 All information provided in this document is subject to legal disclaimers. © NXP Semiconductors N.V. 2015. All rights reserved. Product data sheet Rev. 1 — 23 February 2015 131 of 151 NXP Semiconductors LPC18S50/S30/S10 32-bit ARM Cortex-M3 microcontroller 13.2 Crystal oscillator The crystal oscillator is controlled by the XTAL_OSC_CTRL register in the CGU (see LPC18xx user manual). The crystal oscillator operates at frequencies of 1 MHz to 25 MHz. This frequency can be boosted to a higher frequency, up to the maximum CPU operating frequency, by the PLL. The oscillator can operate in one of two modes: slave mode and oscillation mode. • In slave mode, couple the input clock signal with a capacitor of 100 pF (CC in Figure 41), with an amplitude of at least 200 mV (RMS). The XTAL2 pin in this configuration can be left unconnected. • External components and models used in oscillation mode are shown in Figure 42, and in Table 37 and Table 38. Since the feedback resistance is integrated on chip, only a crystal and the capacitances CX1 and CX2 need to be connected externally in case of fundamental mode oscillation (L, CL and RS represent the fundamental frequency). Capacitance CP in Figure 42 represents the parallel package capacitance and must not be larger than 7 pF. Parameters FC, CL, RS and CP are supplied by the crystal manufacturer. LCD_VD0 - - - - - - P4_1 RED0 LCD_LP P7_6 LCDLP P7_6 LCDLP P7_6 LCDLP P7_6 LCDLP LCD_ENAB /LCDM P4_6 LCDENAB/ LCDM P4_6 LCDENAB/ LCDM P4_6 LCDENAB/ LCDM P4_6 LCDENAB/ LCDM LCD_FP P4_5 LCDFP P4_5 LCDFP P4_5 LCDFP P4_5 LCDFP LCD_DCLK P4_7 LCDDCLK P4_7 LCDDCLK P4_7 LCDDCLK P4_7 LCDDCLK LCD_LE P7_0 LCDLE P7_0 LCDLE P7_0 LCDLE P7_0 LCDLE LCD_PWR 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 36. 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 Table 37. Recommended values for CX1/X2 in oscillation mode (crystal and external components parameters) low frequency mode Fundamental oscillation frequency Maximum crystal series resistance RS External load capacitors CX1, CX2 2 MHz < 200 33 pF, 33 pF < 200 39 pF, 39 pF < 200 56 pF, 56 pF 4 MHz < 200 18 pF, 18 pF < 200 39 pF, 39 pF < 200 56 pF, 56 pF 8 MHz < 200 18 pF, 18 pF < 200 39 pF, 39 pF |
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