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R8C/1B的系统时钟问题?

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对于R8C单片机,系统上电时,默认的CPU时钟为内部低速振荡器的8分频
可由下列步骤切换至内部高速振荡器
/* change low speed OCO to high speed OCO */
void clock_init_highoco(void)
{
unsigned int i=0;
prc0 = 1; // Release protection
hra00 = 1; // High OCO oscillates
while(i<500) i++;
hra01 = 1; // Select High_OCO/8 as CPU clock
cm16 = 0; // no division
cm17 = 0;
cm06 = 0; // Select High_OCO as CPU clock
while(i<500) i++;
cm14 = 1; // Stop Low_OCO
while(i<500) i++;
prc0 = 1; // Set protection
}
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