LPC2xxx System etc periphirals

NXP PLCK divider NXP PCLK Peripheral Clock devider -> PLCK divider (VPB bus clock dividers) Bit1 Bit0 Description 0 0 cclk/4 (1/4 From CPU CLOCK) 0 1 cclk/1 (No division) 1 0 cclk/2 (1/2 From CPU CLOCK) 1 1 cclk/6 or cclk/8. More...

Collaboration diagram for LPC2xxx System etc periphirals:

Files
file	lpc2xxx_pclk.h
	Definitions for NXP LPC2xxx PLCLK (peripheral) module and POWERMODI:E.
file	lpc2xxx_pconp.h
	peripheries masks for PCONP
file	lpc2xxx_pllclk.h
	Definitions for NXP LPC2xxx PLL module.

Macros
#define	CLKSRCSEL_concat(a, b)   CLKSRCSEL_concat2(CLKSRCSEL_Val_,b)
#define	CLKSRCSEL_concat2(a, b)   a##b
#define	CLKSRCSEL_IRC   0
	00 Selects the Internal RC oscillator as the PLL clock source (default).
#define	CLKSRCSEL_RTC   2
	10 Selects the RTC oscillator as the PLL clock source.
#define	CLKSRCSEL_Val   CLKSRCSEL_XTAL /* by default enablin external OSC*/
#define	CLKSRCSEL_Val_0   IRC_OSC_HZ
#define	CLKSRCSEL_Val_1   XTAL_HZ
#define	CLKSRCSEL_Val_2   RTC_CLK_HZ
#define	CLKSRCSEL_XTAL   1
	01 Selects the main oscillator as the PLL clock source.
#define	F_CCLK_HZ   ((PLL_MValue + 1) * F_OSC_HZ)
	Defenitions for Phased Lock Loop (PLL)
#define	F_CCO_HZ   (2 * (1 << PLL_PValue) * F_CCLK_HZ)
#define	F_OSC_HZ   CLKSRCSEL_concat(,CLKSRCSEL_Val)
	there is three clock soursec in lpc2xxx and table here describe sourses and frequency constants.
#define	IRC_OSC_HZ   (4000000UL)/* Internal RC oscillator frequency*/
#define	RTC_CLK_HZ   (32768U)/* external RTC oscillator frequency*/

Detailed Description

NXP PLCK divider NXP PCLK Peripheral Clock devider -> PLCK divider (VPB bus clock dividers) Bit1 Bit0 Description 0 0 cclk/4 (1/4 From CPU CLOCK) 0 1 cclk/1 (No division) 1 0 cclk/2 (1/2 From CPU CLOCK) 1 1 cclk/6 or cclk/8.

Macro Definition Documentation

#define CLKSRCSEL_concat	(		a,
			b
	)		CLKSRCSEL_concat2(CLKSRCSEL_Val_,b)

Definition at line 72 of file lpc2xxx_pllclk.h.

#define CLKSRCSEL_concat2	(		a,
			b
	)		a##b

Definition at line 71 of file lpc2xxx_pllclk.h.

#define CLKSRCSEL_IRC   0

00 Selects the Internal RC oscillator as the PLL clock source (default).

Definition at line 58 of file lpc2xxx_pllclk.h.

#define CLKSRCSEL_RTC   2

10 Selects the RTC oscillator as the PLL clock source.

Definition at line 60 of file lpc2xxx_pllclk.h.

#define CLKSRCSEL_Val   CLKSRCSEL_XTAL /* by default enablin external OSC*/

Definition at line 63 of file lpc2xxx_pllclk.h.

#define CLKSRCSEL_Val_0   IRC_OSC_HZ

Definition at line 67 of file lpc2xxx_pllclk.h.

#define CLKSRCSEL_Val_1   XTAL_HZ

Definition at line 68 of file lpc2xxx_pllclk.h.

#define CLKSRCSEL_Val_2   RTC_CLK_HZ

Definition at line 69 of file lpc2xxx_pllclk.h.

#define CLKSRCSEL_XTAL   1

01 Selects the main oscillator as the PLL clock source.

Definition at line 59 of file lpc2xxx_pllclk.h.

#define F_CCLK_HZ   ((PLL_MValue + 1) * F_OSC_HZ)

Defenitions for Phased Lock Loop (PLL)

• FOR LPC 23xx 24xx
  • FOSC(FIN) is in the range of 32 kHz to 50 MHz.
  • FCCO is in the range of 275 MHz to 550 MHz.
• FOR LPC 21xx 22xx
  • FOSC is in the range of 10 MHz to 25 MHz.
  • CCLK is in the range of 10 MHz to Fmax (the maximum allowed frequency for the microcontroller - determined by the system microcontroller is embedded in).
  • FCCO is in the range of 156 MHz to 320 MHz.

Definition at line 122 of file lpc2xxx_pllclk.h.

#define F_CCO_HZ   (2 * (1 << PLL_PValue) * F_CCLK_HZ)

Definition at line 123 of file lpc2xxx_pllclk.h.

#define F_OSC_HZ   CLKSRCSEL_concat(,CLKSRCSEL_Val)

there is three clock soursec in lpc2xxx and table here describe sourses and frequency constants.

CLKSRCSEL_IRC 0 IRC_OSC_HZ will be select as osc source CLKSRCSEL_XTAL 1 XTAL_HZ will be select as osc source CLKSRCSEL_RTC 2 RTC_CLK_HZ will be select as osc source

use on of the folowing definitions

#define CLKSRCSEL_Val CLKSRCSEL_IRC
#define CLKSRCSEL_Val CLKSRCSEL_XTAL
#define CLKSRCSEL_Val CLKSRCSEL_RTC

Definition at line 88 of file lpc2xxx_pllclk.h.

#define IRC_OSC_HZ   (4000000UL)/* Internal RC oscillator frequency*/

Definition at line 53 of file lpc2xxx_pllclk.h.

#define RTC_CLK_HZ   (32768U)/* external RTC oscillator frequency*/

Definition at line 56 of file lpc2xxx_pllclk.h.