HD64336900G Datasheet, PDF (200/408 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcomputer H8 Family/H8/300H Tiny Series

12.5 Operation Timing
12.5.1 TCNT Count Timing
Figure 12.14 shows the TCNT count timing when the internal clock source is selected. Figure
12.15 shows the timing when the external clock source is selected. The pulse width of the external
clock signal must be at least two system clock (φ) cycles; shorter pulses will not be counted
correctly.
Internal
clock
TCNT input
clock
Rising edge
TCNT
N
N+1
N+2
Figure 12.14 Count Timing for Internal Clock Source
External
clock
TCNT input
clock
TCNT
Rising edge
N
Rising edge
N+1
N+2
Figure 12.15 Count Timing for External Clock Source
Rev. 1.00, 11/03, page 172 of 376