Voltage scaling system with sleep mode
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United States of America Patent
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Mar 12, 2019
Grant Date -
Sep 22, 2016
app pub date -
Mar 28, 2016
filing date -
Sep 13, 2012
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Abstract
A voltage scaling system can scale a supply voltage while preventing processor access of system components that are rendered unstable from the scaling. A processor receives an instruction to scale a system supply voltage to a target supply voltage. The processor executes the instruction and enters into a sleep mode. The processor can send, to a controller that saves power, an indication that the processor is in the sleep mode. When the processor is in the sleep mode, the processor becomes inactive and cannot access any components, e.g., Flash memory data, of the voltage scaling system. The controller can configure a voltage regulator to scale the system supply voltage to the target supply voltage. Once the target supply voltage is reached, the voltage regulator sends an interrupt to the processor, thereby waking up the processor from the sleep mode.
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