单片机系统时钟延时

#include <REGtenxTM52FN8276.h>
#include <intrins.h>

#include "tm52fn8276_bsp.h"

/* 快时钟系统主频为 14.7456M/2 = 7.3728M
 */
void bsp_clock_init()
{
    SELFCK = 0; // 切换到慢时钟

    CLKCON = 0x02; // div 2	时钟分频
    delay_10nop();
    SELFCK = 1; // 切换到快时钟
}

void bsp_delay_ms(unsigned int ms)
{
    unsigned int i;
    unsigned char delay_cnt;
    for (i = 0; i < ms; i++)
    {
        delay_cnt = 200;
        while (delay_cnt--)
        {
            delay_10nop();
        }
    }
}