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AM335X 计时用的时钟频率设置

Other Parts Discussed in Thread: AM3359

您好,我想计算一个中断(利用starterware编写)的响应,处理的时间,现行的的方法是利用DMTimer来计时,但DMTimer的时钟源的频率貌似有限,下面是《AM335x_Technical Reference Manual》上的记载:

20.1.2.2 Timer Clock and Reset Management
  Each DMTimer[2–7] functional clock is selected within the PRCM using the associated CLKSEL_TIMERx_CLK register from 3 possible sources:
• The 24-MHz (typ) system clock (CLK_M_OSC)
• The PER PLL generated 32.768 KHz clock (CLK_32KHZ)
• The TCLKIN external timer input clock.
The DMTimer 0 functional clock is fixed to use the internal 32KHz RC Clock (CLK_RC32K).

24MHZ的系统时钟是不能满足中断响应时间的计时的,TCLKIN时钟实现起来有点难度,AM335x中,还有其他可利用的,高频率的(至少100MHZ),可用来计时的单元吗?