Propeller Manual

Table Of Contents

_CLKFREQ – Spin Language Reference

Page 66 · Propeller Manual v1.1

CON

_CLKMODE = XTAL2

_CLKFREQ = 10_000_000

These two declarations set the clock mode for an external medium-speed crystal, no Clock

PLL multiplier, and a System Clock frequency of 10 MHz. The

_XINFREQ value is

automatically set to 10 MHz, as well, because of these declarations.

_CLKFREQ vs CLKFREQ

_CLKFREQ is related to, but not the same as, CLKFREQ. _CLKFREQ contains the application’s

System Clock frequency at startup whereas

CLKFREQ is a command that returns the current

System Clock frequency. In other words,

_CLKFREQ is the original System Clock frequency

and

CLKFREQ is the current System Clock frequency; they both may happen to be the same

value but they certainly can be different.