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TCNT Count Timing:
• Operating on internal clock
Any of five count clocks (Pφ/4, Pφ/16, Pφ/64, Pφ/256, or Pφ/1024) scaled from the peripheral
module clock can be selected as the count clock by means of the TPSC2–TPSC0 bits in TCR.
Figure 12.4 shows the timing in this case.
Pφ
Internal clock
TCNT
Figure 12.4 Count Timing when Operating on Internal Clock
• Operating on external clock
External clock pin (TCLK) input can be selected as the timer clock by means of the TPSC2–
TPSC0 bits in TCR. The detected edge (rising, falling, or both edges) can be selected with the
CKEG1 and CKEG0 bits in TCR.
Figure 12.5 shows the timing for both-edge detection.
Pφ
External clock
input pin
TCNT
Figure 12.5 Count Timing when Operating on External Clock
• Operating on on-chip RTC output clock
The on-chip RTC output clock can be selected as the timer clock by means of the TPSC2–
TPSC0 bits in TCR. Figure 12.6 shows the timing in this case.
N + 1
N + 1
N
N
Rev. 4.0, 04/00, page 253 of 850
N – 1
N – 1
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