SN8P1602AX datasheet(45/94 Pages) SONIX

Teilenummer	SN8P1602AX

Bauteilbeschribung	8-Bit Micro-Controller

PDF	94 Pages

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Hersteller	SONIX [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

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