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SN8P1602AS Datasheet(PDF) 45 Page - SONiX Technology Company |
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SN8P1602AS Datasheet(HTML) 45 Page - SONiX Technology Company |
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45 / 94 page  SN8P1600 8-bit micro-controller SONiX TECHNOLOGY CO., LTD Page 45 Revision 1.94 External RC Oscillator Frequency Measurement There are two ways to get the Fosc frequency of external RC oscillator. One measures the XOUT output waveform. Under external RC oscillator mode, the XOUT outputs the square waveform whose frequency is Fcpu. The other measures the external RC frequency by instruction cycle (Fcpu). The external RC frequency is the Fcpu multiplied by 4. We can get the Fosc frequency of external RC from the Fcpu frequency. The sub-routine to get Fcpu frequency of external oscillator is as the following. Example: Fcpu instruction cycle of external oscillator B0BSET P1M.0 ; Set P1.0 to be output mode for outputting Fcpu toggle signal. @@: B0BSET P1.0 ; Output Fcpu toggle signal in low-speed clock mode. B0BCLR P1.0 ; Measure the Fcpu frequency by oscilloscope. JMP @B |
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