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SH7243 Datasheet(PDF) 122 Page - Renesas Technology Corp |
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SH7243 Datasheet(HTML) 122 Page - Renesas Technology Corp |
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122 / 1726 page  Section 4 Clock Pulse Generator (CPG) Rev. 1.00 Jun. 26, 2008 Page 92 of 1692 REJ09B0393-0100 4.8.2 Input of an External 48-MHz Clock Signal Figure 4.6 shows an example of the connections for input of an external 48-MHz clock signal. The USBXTAL pin must be left open. USBEXTAL USBXTAL Open state Input external clock Figure 4.6 Example of Connecting an External 48-MHz Clock Table 4.7 shows the input conditions for the external 48-MHz clock. Table 4.7 Input Conditions for the External 48-MHz Clock Item Symbol Min. Max. Unit Reference Figure Frequency (48 MHz) t FREQ 47.88 48.12 MHz Clock rise time t R48 — 3 ns Clock fall time t F48 — 3 ns Duty (t HIGH/tFREQ) t DUTY 40 60 % Figure 4.7 90% 10% t R48 t F48 t HIGH t LOW t FREQ V CC×5 USBEXTAL Figure 4.7 Input Timing of External 48-MHz Clock |
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