Atmega328p clock and safe operation zone
hi guys, im not used write in english hope guys can understand. have doubts using arduino pro mini 3v3@8mhz
- know possible change clock 1 mhz fuses setting ckdiv8 '0'. dont understand if possible divide internal 8 mhz clock intermediate values 4 mhz , 2 mhz.
- know can divide clock program running. problem run arduino voltage less 2,4v , arduino start @ 8mhz(out of safe operation area) later change clock 4mhz(inside of safe operation area). there way software in safe zone ?
from datasheet
- know possible change clock 1 mhz fuses setting ckdiv8 '0'. dont understand if possible divide internal 8 mhz clock intermediate values 4 mhz , 2 mhz.
- know can divide clock program running. problem run arduino voltage less 2,4v , arduino start @ 8mhz(out of safe operation area) later change clock 4mhz(inside of safe operation area). there way software in safe zone ?
from datasheet
start @ 1mhz ckdiv8 fuse set.
compile board definition specifies actual speed want run board @ (4 or 2).
in setup(), set prescaler 2 (for 4 mhz) or 4 (for 2) instead of 8. see pages 34-37 of datasheet details.
the startup state of clkpr determined ckdiv8 fuse - it's set prescaler of 1, or 8 if ckdiv8 set.
compile board definition specifies actual speed want run board @ (4 or 2).
in setup(), set prescaler 2 (for 4 mhz) or 4 (for 2) instead of 8. see pages 34-37 of datasheet details.
the startup state of clkpr determined ckdiv8 fuse - it's set prescaler of 1, or 8 if ckdiv8 set.
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