When using the prescaler, the user software can change the value of the period register
faster than one timer period.
Figure 23-7 and Figure 23-6
show that when the counter is operating with an 8x prescale and PRx is written before
the end of the prescaler rollover, a period match is not detected and an interrupt is
not generated. In this case, the timer will continue running until a compare match
occurs between TMRx and the new value M. If M is lower than the original
period of N, the timer will run all the way to 0xFFFF_FFFF and rollover to
0x0000_0000.Figure 23-6. Synchronized External Clock
with 8:1 Prescale Timing Diagram (TCS = 1, TCKPS[1:0] = 1)Figure 23-7. Synchronous Clock with
Prescale with Write to PRx Following Match (TCS = 0, TCKPS[1:0] =1)
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