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of a halt that waits for an interrupt), data is transferred to the low-leakage cells, and the others are turned off. When the CPU leaves a low-leakage mode (e.g. because of an interrupt), the process is reversed.

Older designs would copy the CPU state to memory, or even disk, sometimes with specialized software. Very simple embedded systems sometimes just restart.

Integrating with the computer

All modern CPUs have control logic to attach the CPU to the rest of the computer. In modern computers, this is usually a bus

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