[51] DS89c450 - where does the divide by 3072 come from ?

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dxpwny

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I've been looking at the figures in the Dallas ds89c450 User Guide, like figure 11-2 "Timers/Counters 0 and 1, Mode 2". I'm trying to figure out how the figure of divide by 3072 is obtained for the input clock to Timer 1.

With CD1 / CD0 both 1, the micro is in Power Management Mode. So, the system clock is divided by 1024.

With T1MH and T1M both 0, the input clock to Timer 1 is then osc / 3072. Why ?

Why isn't it (osc / 1024) / 12 ?
 

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