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HD64F2145 Datasheet(PDF) 323 Page - Renesas Technology Corp

Part # HD64F2145
Description  Hitachi 16-Bit Single-Chip Microcomputer
PDF  829 Pages
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Manufacturer  RENESAS [Renesas Technology Corp]
Direct Link  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

HD64F2145 Datasheet(HTML) 323 Page - Renesas Technology Corp

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Rev. 2.0, 08/02, page 283 of 788
12.5
Operation Timing
12.5.1
TCNT Count Timing
Figure 12.4 shows the TCNT count timing with an internal clock source. Figure 12.5 shows the
TCNT count timing with an external clock source. The pulse width of the external clock signal
must be at least 1.5 system clocks (ø) for a single edge and at least 2.5 system clocks (ø) for both
edges. The counter will not increment correctly if the pulse width is less than these values.
Ø
Internal clock
TCNT input
clock
TCNT
N – 1
N
N + 1
Figure 12.4 Count Timing for Internal Clock Input
Ø
External clock
input pin
TCNT input
clock
TCNT
N – 1
N
N + 1
Figure 12.5 Count Timing for External Clock Input (Both Edges)



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