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
Data and address bus width of 8085 microprocessor respectively are
The number of interrupts handled by 8051 microcontroller (other than Reset) is _____.
How many bits are used in the data bus of 8051 ?
16-bit registers consist of:
- The 8051 microcontroller has __________ on-chip RAM and __________ on-chip ROM.
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