To conserve power (_CLKMODE = XTAL1 + PLL1X, _XINFREQ = 5_000_000)
JChris
Posts: 58
in Propeller 1
Hi,
I use a RN4020 bluetooth device and USR-K3 Ethernet device with a propeller.
I try to conserve power using a frequency lower that 80 Mhz.
The frequency that I would like to use is 5 MHz.
The communication between devices and propeller is 9600 and the communication with the terminal is 57600
I don't understand why at 5 Mhz the communication between propeller and USR-K3 Ethernet device works whereas it doesn't work with RN4020 bluetooth device.
The communication between propeller and RN4020 works only at 10 MHz and higher but not at 5 Mhz.
When I communicate at 5 Mhz, the responses of bluetooth device I display on terminal don't match (I get special characters)
If anyone has an hint, I would appreciate
I use a RN4020 bluetooth device and USR-K3 Ethernet device with a propeller.
I try to conserve power using a frequency lower that 80 Mhz.
The frequency that I would like to use is 5 MHz.
The communication between devices and propeller is 9600 and the communication with the terminal is 57600
I don't understand why at 5 Mhz the communication between propeller and USR-K3 Ethernet device works whereas it doesn't work with RN4020 bluetooth device.
The communication between propeller and RN4020 works only at 10 MHz and higher but not at 5 Mhz.
When I communicate at 5 Mhz, the responses of bluetooth device I display on terminal don't match (I get special characters)
If anyone has an hint, I would appreciate
Comments
XTAL1 alone will draw less current then XTAL1+PLL1, no change in performance. (about 1.0mA vs 1.7mA for a single cog) . Only need the PLL on if you want fastest transition in PLLx clock settings.