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What about using signal from TX pin on tranceiver? You can connect TX to external interrupt pin on MCU. Falling edge on TX will generate an interrupt, which waked up MCU.
Yes, mega32 will work. Still at 1MHz.
To switch to external crystal you should set CKSEL0, CKSEL1, CKSEL2 and CKSEL3 fuses ("set" means "1").
What program do you use to downloading program to MCU?
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