[Atmel] 跑一下XMEGA-B1程序(13)进一步时钟配置

#ifndef CONF_CLOCK_H_INCLUDED

#define CONF_CLOCK_H_INCLUDED



#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_RC2MHZ

//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_RC32MHZ

//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_RC32KHZ

//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_XOSC

//#define CONFIG_SYSCLK_SOURCE        SYSCLK_SRC_PLL

#define CONFIG_OSC_AUTOCAL_RC2MHZ_REF_OSC   OSC_ID_RC32KHZ



/* Fbus = Fsys / (2 ^ BUS_div) */

#define CONFIG_SYSCLK_PSADIV          SYSCLK_PSADIV_1

#define CONFIG_SYSCLK_PSBCDIV         SYSCLK_PSBCDIV_1_2



//#define CONFIG_PLL0_SOURCE          PLL_SRC_XOSC

#define CONFIG_PLL0_SOURCE          PLL_SRC_RC2MHZ

//#define CONFIG_PLL0_SOURCE          PLL_SRC_RC32MHZ



/* Fpll = (Fclk * PLL_mul) / PLL_div */

#define CONFIG_PLL0_MUL             (32000000UL / BOARD_XOSC_HZ)

#define CONFIG_PLL0_DIV             1



/* External oscillator frequency range */

/** 0.4 to 2 MHz frequency range */

//#define CONFIG_XOSC_RANGE XOSC_RANGE_04TO2

/** 2 to 9 MHz frequency range */

//#define CONFIG_XOSC_RANGE XOSC_RANGE_2TO9

/** 9 to 12 MHz frequency range */

//#define CONFIG_XOSC_RANGE XOSC_RANGE_9TO12

/** 12 to 16 MHz frequency range */

//#define CONFIG_XOSC_RANGE XOSC_RANGE_12TO16



/* DFLL autocalibration */

//#define CONFIG_OSC_AUTOCAL_RC2MHZ_REF_OSC  OSC_ID_RC32KHZ

//#define CONFIG_OSC_AUTOCAL_RC32MHZ_REF_OSC OSC_ID_XOSC



/* The following example clock configuration definitions can be used in XMEGA

 * devices that contain a USB controller. It configures the USB controller clock

 * source to use the internal (nominally) 32MHz RC oscillator, up-calibrated to

 * run at 48MHz via the periodic 1ms USB Start Of Frame packets sent by the

 * host. The USB controller requires 48MHz for Full Speed operation, or 6MHz

 * for USB Low Speed operation.

 *

 * Note that when the 32MHz RC oscillator is tuned to 48MHz, it cannot be used

 * directly as the system clock source; it must either be prescaled down to a

 * speed below the maximum operating frequency given in the datasheet, or an

 * alternative clock source (e.g. the internal 2MHz RC Oscillator, multiplied

 * to a higher frequency via the internal PLL module) must be used instead.

 */

#define CONFIG_USBCLK_SOURCE                USBCLK_SRC_RCOSC

#define CONFIG_OSC_RC32_CAL                 48000000UL

#define CONFIG_OSC_AUTOCAL_RC32MHZ_REF_OSC  OSC_ID_USBSOF

//#define CONFIG_OSC_AUTOCAL          OSC_ID_RC32MHZ



/* Use to enable and select RTC clock source */

//#define CONFIG_RTC_SOURCE           SYSCLK_RTCSRC_ULP



#endif /* CONF_CLOCK_H_INCLUDED */