Keyboard Interfacing With 8086 Using 8255 Pdf 153 ((FREE))
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Keyboard Interfacing With 8086 Using 8255 Pdf 153
the 8255 pdf is accessed using the exclusive function. the first parameter is the address of the 8255 pdf. the second parameter is a bitmask with the bits of the address representing the bits of the 8255 pdf. for instance, the address 0xffa0 is represented by the following bitmask:
the third parameter is a pointer to the first keyboard data. when the 8255 pdf has been accessed, it returns a string containing the current keyboard data. the data is read only the first time the 8255 pdf is accessed.
the second keyboard is connected to the first keyboard using the set_device_addr function. the first parameter is the address of the 8255 pdf. the second parameter is the address of the second keyboard. this address is calculated using the address of the 8255 pdf and the bitmask of the address of the first keyboard. for instance, the address of the second keyboard is:
0xffa0 + 0x100 = 0xfff0
the second keyboard is accessible only if the first keyboard is accessible and the bit corresponding to the first keyboard in the bitmask of the second keyboard is not cleared.
this document was written to explain the 8255 program found in the 8255 pdf file 153. this is a simple program that takes a keyboard input and displays it on the screen. also by using the 8255, we can interface with the 8086 and its memory space. this is usually accomplished by having the 8086 send a byte or a word to the 8255 and then the 8255 displays that byte or word on the screen.
the next program that we will examine is the program in the 8255.cpp file. this program is an extended version of the 8255.h program. this program not only prints out the letter ‘a’ on the screen, but it also prints out other characters that are available in the keyboard buffer. the program has three functions. the first function checks to see if a key is pressed on the keyboard. if a key is pressed the the function will print the ascii code for the key that was pressed.
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