leftyretro
New Member
In anticipation of my 28X1 arriving (soon I hope!) I would like a little help on understanding external resonator Vs the Setfreq command. The new manual2 states that the yet to be released X2 uses a 4X PLL so that external resonators need to be 4 times slower then that actual clock speed desired. Does the X1 also share this 4X PLL or is an external resonator a one to one relationship?
I plan on using an external crystal oscillator module and would like to run my 28X1 at 16mhz, so I need to know if I use a 4mhz or 16 mhz external oscillator. Also after a power up reset does the 28X1 use the internal 4 mhz clock and automatically switch to an external oscillator if present, or does one have to start their user program with 'Setfreq EM16' command? What happens automatically and what happens only via commands is not real clear to me yet.
Thanks for any clairfication anyone can supply.
Lefty
Edited by - retrolefty on 13/05/2007 01:34:58
I plan on using an external crystal oscillator module and would like to run my 28X1 at 16mhz, so I need to know if I use a 4mhz or 16 mhz external oscillator. Also after a power up reset does the 28X1 use the internal 4 mhz clock and automatically switch to an external oscillator if present, or does one have to start their user program with 'Setfreq EM16' command? What happens automatically and what happens only via commands is not real clear to me yet.
Thanks for any clairfication anyone can supply.
Lefty
Edited by - retrolefty on 13/05/2007 01:34:58