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Rev. 5.00, 09/03, page 402 of 760
Auto-Reload Count Operation: Figure 12.3 shows the TCNT auto-reload operation.
TCNT value
TCOR
H'00000000
STR0−STR2
UNF
TCOR value set to
TCNT during underflow
Time
Figure 12.3 Auto-Reload Count Operation
TCNT Count Timing:
• Internal Clock Operation: Set the TPSC2–TPSC0 bits in TCR to select whether peripheral
module clock Pφ or one of the four internal clocks created by dividing it is used (Pφ/4, Pφ/16,
Pφ/64, Pφ/256). Figure 12.4 shows the timing.
Pφ
Internal
clock
TCNT
input clock
TCNT
N + 1 N N − 1
Figure 12.4 Count Timing when Operating on Internal Clock