KEYPAD                                                                                             APPLICATION FILE PAGE

 

FILE

TYPE

Created using

 

OPERATION

 

The keypad application demonstrates keyboard scanning and the 7-segment LED display.

 

The keypad is scanned by setting each row low in turn, and checking the columns. A count of keys is kept, so that when a button is detected as a low on a column, the process quits with the key count corresponding to the key number.

 

This is then converted into a seven segment code for display using a program data table.

KEYPAD.DSN

Proteus VSM Design File

ISIS Schematic Capture

KEYPAD.ASM

Program Source Code

Source code editor in ISIS

KEYPAD.LST

Program List File

Assembler MPASM in Proteus VSM

KEYPAD.HEX

Program Machine Code

Assembler MPASM in Proteus VSM