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TCNT value
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GR
H'0000
STR bit
IMF
•
TCNT count timing
— Internal clock source
Bits TPSC2 to TPSC0 in TCR select the system clock (ø) or one of three internal clock
sources obtained by prescaling the system clock (ø/2, ø/4, ø/8).
Figure 10-17 shows the timing.
ø
Internal
clock
TCNT input
TCNT
N – 1
Figure 10-16 Periodic Counter Operation
Figure 10-17 Count Timing for Internal Clock Sources
Counter cleared by general
register compare match
N
339
Time
N + 1
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