Question

Q5

A) Draw a diagram showing the interface between a hexadecimal keypad and 8051 microcontroller with port 1 (least Significant Bits) connected to the rows and port 2 (least significant bits) connected to the columns. Write the value written on the port 1 and value read on port 2 to detect key pressed F. Write the necessary assembly instructions only to detect the columns position of the pressed key and to find the corresponding ASCII code.

B) Write Write necessary assembly instructions to send a command ‘Clear Display Screen’ (01H) to the LCD.

Answer 1

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