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.
Important Questions from Microprocessors and Microcontrollers
Data and address bus width of 8085 microprocessor respectively are
How many bits are used in the data bus of 8051 ?
- Which of the 8051 ports need pull-up resistors to function as an I/O port?
How many bytes are used by the given data directive of the 8051 microcontroller?
DATA_1 DB "INDIA"
A. Microcontrollers are normally less expensive than microprocessors.
B. The 8051 microcontroller has three on-chip timers.
C. Mode 2 of 8051 timer is used to set the baud rate.
D. For the LCD to recognize information at the data pins as data, the register select (RS) pin must be set to low.
E. A driver must be placed between the micrcontroller and the stepper motor.
Choose the correct answer from the options given below:
