Question
In 8051 microcontroller, PSEN is an _____ output signal used as a read strobe for accessing the _____ memory.
The correct answer is
active low, external program
Understanding the 8051 PSEN Signal
The PSEN (Program Store Enable) signal in the 8051 microcontroller is crucial for memory operations.
- Signal Nature: PSEN is an output signal generated by the 8051.
- Active State: It functions as an active low signal. This means the signal is considered active or 'on' when its voltage level is low.
- Purpose: Its specific role is to act as a read strobe to enable reading from external program memory. When the microcontroller fetches instructions from outside its internal memory, it uses PSEN to signal the external memory device.
Based on this, PSEN is an active low signal used for reading external program memory.
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Important Questions from Microprocessors and Microcontrollers
16-bit registers consist of:
78xx series ICs are:
In 8051 microcontroller the resultant of two numbers added is ________.
For pulse generation, the IC used is:
The Size of internal RAM of 8051 Microcontroller is?
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