Rev. 1.00, 09/03, page 252 of 704
10.5 Operation
Timing
10.5.1
FRC Increment Timing
Figure 10.3 shows the FRC increment timing with an internal clock source. Figure 10.4 shows the
increment timing with an external clock source. The pulse width of the external clock signal must
be at least 1.5 system clocks (
φ
). The counter will not increment correctly if the pulse width is
shorter than 1.5 system clocks (
φ
).
φ
Internal clock
FRC input
clock
FRC
N – 1
N + 1
N
Figure 10.3 Increment Timing with Internal Clock Source
φ
External clock
input pin
FRC input
clock
FRC
N + 1
N
Figure 10.4 Increment Timing with External Clock Source
Содержание H8S/2437
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