LPC1857_53 NXP Semiconductors, LPC1857_53 Datasheet - Page 116

• Manufacturer Part Number: LPC1857_53
• Description: The LPC1857/53 are ARM Cortex-M3 based microcontrollers for embedded applications
• Manufacturer: NXP Semiconductors

NXP Semiconductors
Table 26.
LPC1857_53
Objective data sheet
External
pin
LCD_VD0
LCD_LP
LCD_ENAB
/LCDM
LCD_FP
LCD_DCLK P4_7
LCD_LE
LCD_PWR
GP_CLKIN
LCD panel connections for TFT panels
TFT 12 bit (4:4:4
mode)
LPC18xx
pin used
-
P7_6
P4_6
P4_5
P7_0
P7_7
PF_4
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.
Table 27.
Fundamental oscillation
frequency
2 MHz
4 MHz
8 MHz
LCD
function
-
LCDLP
LCDENAB/
LCDM
LCDFP
LCDDCLK
LCDLE
LCDPWR
LCDCLKIN PF_4
•
•
In slave mode, couple the input clock signal with a capacitor of 100 pF (C
Figure
configuration can be left unconnected.
External components and models used in oscillation mode are shown in
and in
only a crystal and the capacitances C
case of fundamental mode oscillation (L, C
frequency). Capacitance C
and must not be larger than 7 pF. Parameters F
crystal manufacturer.
Table 27
Recommended values for C
components parameters) low frequency mode
33), with an amplitude of at least 200 mV (RMS). The XTAL2 pin in this
TFT 16 bit (5:6:5 mode)
LPC18xx
pin used
-
P7_6
P4_6
P4_5
P4_7
P7_0
P7_7
All information provided in this document is subject to legal disclaimers.
and
Rev. 1 — 14 December 2011
Table
LCD
function
-
LCDLP
LCDENAB/
LCDM
LCDFP
LCDDCLK
LCDLE
LCDPWR
LCDCLKIN
28. Since the feedback resistance is integrated on chip,
P
in
Maximum crystal series
resistance R
< 200 
< 200 
< 200 
< 200 
< 200 
< 200 
< 200 
< 200 
Figure 34
X1/X2
TFT 16 bit (1:5:5:5 mode) TFT 24 bit
LPC18xx pin
used
-
P7_6
P4_6
P4_5
P4_7
P7_0
P7_7
PF_4
X1
in oscillation mode (crystal and external
and C
represents the parallel package capacitance
S
L
and R
32-bit ARM Cortex-M3 microcontroller
X2
C
need to be connected externally in
LCD
function
-
LCDLP
LCDENAB/
LCDM
LCDFP
LCDDCLK
LCDLE
LCDPWR
LCDCLKIN PF_4
, C
S
L
represent the fundamental
, R
S
and C
External load capacitors
C
33 pF, 33 pF
39 pF, 39 pF
56 pF, 56 pF
18 pF, 18 pF
39 pF, 39 pF
56 pF, 56 pF
18 pF, 18 pF
39 pF, 39 pF
LPC1857/53
X1
LPC18xx
pin used
P4_1
P7_6
P4_6
P4_5
P4_7
P7_0
P7_7
, C
P
X2
are supplied by the
© NXP B.V. 2011. All rights reserved.
LCD
function
RED0
LCDLP
LCDENAB/
LCDM
LCDFP
LCDDCLK
LCDLE
LCDPWR
LCDCLKIN
Figure
C
in
116 of 131
34,