Use 8051`s power-down mode to the fullest

Posted on Oct 13, 2012

The 8051 series µCs offer idle and power-down modes, both of which you invoke by setting appropriate control bits from the code. For instance, a 5V, 12-MHz Atmel AT89C2051 consumes approximately 9 mA in active mode, 1.8 mA in idle mode, and only 12 µA in power-down mode. Although power-down savings outperform those of the idle mode by two orders of magnitude, the only way to restore the AT89C2051`s operation from a power-down state is to reset, which constitutes a serious drawback for system designers.

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