system_sam3xa.c File Reference

Provides the low-level initialization functions that called on chip startup. More...

#include "sam3xa.h"

Macros
#define	SYS_BOARD_OSCOUNT   (CKGR_MOR_MOSCXTST(0x8))
#define	SYS_BOARD_PLLAR
#define	SYS_BOARD_MCKR   (PMC_MCKR_PRES_CLK_2 | PMC_MCKR_CSS_PLLA_CLK)
#define	SYS_UTMIPLL   (480000000UL) /* UTMI PLL frequency */
#define	SYS_CKGR_MOR_KEY_VALUE   CKGR_MOR_KEY(0x37) /* Key to unlock MOR register */

Functions
void	SystemInit (void)
	Setup the microcontroller system. Initialize the System and update the SystemFrequency variable. More...
void	SystemCoreClockUpdate (void)
	Updates the SystemCoreClock with current core Clock retrieved from cpu registers. More...
void	system_init_flash (uint32_t dw_clk)

Variables
uint32_t	SystemCoreClock = CHIP_FREQ_MAINCK_RC_4MHZ

Detailed Description

Provides the low-level initialization functions that called on chip startup.

$asf_license$

Purpose

This file provides basic support for Cortex-M processor based microcontrollers.

Author

Atmel Corporation: http://www.atmel.com
Support and FAQ: http://support.atmel.no/

Macro Definition Documentation

#define SYS_BOARD_PLLAR

Value:

(CKGR_PLLAR_ONE \
                            | CKGR_PLLAR_MULA(0xdUL) \
                            | CKGR_PLLAR_PLLACOUNT(0x3fUL) \
                            | CKGR_PLLAR_DIVA(0x1UL))

Function Documentation

void system_init_flash

(

uint32_t

dw_clk

)

Initialize flash.

void SystemCoreClockUpdate

(

void

)

Updates the SystemCoreClock with current core Clock retrieved from cpu registers.

Update SystemCoreClock variable

Parameters

none

Returns

none

void SystemInit

(

void

)

Setup the microcontroller system. Initialize the System and update the SystemFrequency variable.

Setup the microcontroller system. Initialize the System and update the SystemCoreClock variable.

Variable Documentation

uint32_t SystemCoreClock = CHIP_FREQ_MAINCK_RC_4MHZ

System Clock Frequency (Core Clock)