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H8/3003 Datasheet(PDF) 344 Page - Renesas Technology Corp

No. de pieza H8/3003
Descripción Electrónicos  microcontroller (MCU)
PDF  715 Pages
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Fabricante Electrónico  RENESAS [Renesas Technology Corp]
Página de inicio  http://www.renesas.com
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H8/3003 Datasheet(HTML) 344 Page - Renesas Technology Corp

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— External clock source
Bits TPSC2 to TPSC0 in TCR select an external clock input pin (TCLKA to TCLKD),
and its valid edge or edges are selected by bits CKEG1 and CKEG0. The rising edge,
falling edge, or both edges can be selected.
The pulse width of the external clock signal must be at least 1.5 system clocks when a
single edge is selected, and at least 2.5 system clocks when both edges are selected.
Shorter pulses will not be counted correctly.
Figure 10-18 shows the timing when both edges are detected.
Figure 10-18 Count Timing for External Clock Sources (when Both Edges are Detected)
ø
TCNT input
TCNT
External
clock input
N – 1
N
N + 1
326



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