楼主，你使用的osc8M，如果使用外部晶振32K的，我看到例程里

int main(void)

{

//! [main]

/* Configure the external 32KHz oscillator */

//! [config_extosc32k_main]

configure_extosc32k();//配置32K的外部晶振

//! [config_extosc32k_main]

/* Enable the external 32KHz oscillator */

//! [enable_extosc32k_main]

enum status_code osc32k_status =

system_clock_source_enable(SYSTEM_CLOCK_SOURCE_XOSC32K);//使能32K的外部晶振

if (osc32k_status != STATUS_OK) {

/* Error enabling the clock source */

}

//! [enable_extosc32k_main]

/* Configure the DFLL in open loop mode using default values */

//! [config_dfll_main]

configure_dfll_open_loop();//使用默认值来配置数字锁相环为开环模式

//! [config_dfll_main]

/* Enable the DFLL oscillator */

//! [enable_dfll_main]

enum status_code dfll_status =

system_clock_source_enable(SYSTEM_CLOCK_SOURCE_DFLL);//使能数字锁相环

if (dfll_status != STATUS_OK) {

/* Error enabling the clock source */

}

//! [enable_dfll_main]

/* Configure flash wait states before switching to high frequency clock */

//! [set_sys_wait_states]

system_flash_set_waitstates(2);//转换为高频时钟之前配置Flash为等待状态

//! [set_sys_wait_states]

/* Change system clock to DFLL *///将系统时钟转换为数字锁相环时钟

//! [set_sys_clk_src]

struct system_gclk_gen_config config_gclock_gen;

system_gclk_gen_get_config_defaults(&config_gclock_gen);

config_gclock_gen.source_clock    = SYSTEM_CLOCK_SOURCE_DFLL;

config_gclock_gen.division_factor = 1;

system_gclk_gen_set_config(GCLK_GENERATOR_0, &config_gclock_gen);

//! [set_sys_clk_src]

//! [main]

while (true) {

}

}

但是始终找不到配置晶振的IO设置