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L9805 датащи(PDF) 15 Page - STMicroelectronics |
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L9805 датащи(HTML) 15 Page - STMicroelectronics |
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15 / 103 page ![]() 15/103 L9805 CLOCK SYSTEM (Cont’d) 3.1.2 External Clock An external clock may be applied to the OSCIN in- put with the OSCOUT pin not connected, as shown on Figure 4. The tOXOV specifications does not apply when using an external clock input. The equivalent specification of the external clock source should be used instead of tOXOV (see ). Figure 7. Timing Diagram for Internal CPU Clock Frequency transitions b1 : b2 MISCELLANEOUS REGISTER 00 01 b0 1 1 0 OSC/2 OSC/4 OSC/8 CPU CLK VR02062B New frequency requested New frequency active when osc/4 & osc/8 = 0 Normal mode active (osc/4 - osc/8 stopped Normal mode requested |
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