?? pll.c
字號:
// PLL 模塊
// 控制芯片的頻率, 通過倍頻
#include "includes.h"
//********* PLL_Init ****************
// Set PLL clock to 48 MHz, and switch 9S12 to run at this rate
// Inputs: none
// Outputs: none
// Errors: will hang if PLL does not stabilize
void InitPLL(void)
{
#if PLLCLK > 48 || PLLCLK < 2
#error "Pll clock set fail"
#elif PLLCLK == 48 && OSSCLK == 16
SYNR = PLLCLK / 2 - 1;
REFDV = OSSCLK - 1;
/* PLLCLK = 2 * OSCCLK * (SYNR + 1) / (REFDV + 1)
Values above give PLLCLK of 48 MHz with 4 MHz crystal.
(OSCCLK is Crystal Clock Frequency) */
while (!( CRGFLG & 0x08 )); //等待PLL穩定
CLKSEL_PLLSEL = 1; // 切換到PLL的頻率
#else
#error "Pll clock set fail"
#endif
}
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