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Originally Posted by segatang
No reason why the same X-scale CPU based iLiad cannot make it.
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You (and many others, I think) gut the wrong impression here. The iLiad CAN do all the modes you described. "Turn-off" is implemented. "Hibernate" is not, as the build in flash is to small, but nothing stops iRex or any third-party hacker from implementing it with a memory card. "Standby" is what the iLiad does between key presses, although it is not yet complete.
What the iLiad can not do is "Suspend to RAM", that is Standby + disabling the CPU, so the only components that would still consume power would be the RAM, the realtime clock, the memory controller and the keyboard controller. There simply are no memory or keyboard controllers (as I understand), so the CPU must do that work.
However, I'd guess the difference in power consumption between dedicated memory plus keyboard controllers and the CPU in 33Mhz mode is not very big.