Question

The state of signals in power down mode is

(a) ALE is high

(b) PSEN is low

(c) ALE and PSEN(active low) are high

(d) ALE and PSEN(active low) are low

I had been asked this question in examination.

Question is taken from Power Control Register topic in section Microcontroller 8051 of Microprocessor

Answer 1

The correct answer is (d) ALE and PSEN(active low) are low

To explain I would say: ALE and PSEN(active low) remain low in power down mode of 8051.