keyboard interfacing keyboards are organized in a matrix of rows and columns the cpu accesses both...

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KEYBOARD INTERFACING • Keyboards are organized in a matrix of rows and columns The CPU accesses both rows and columns through ports . • Therefore, with two 8-bit ports, an 8 x 8 matrix of keys can be connected to a microprocessor When a key is pressed, a row and a column make a contact .

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4x4 matrix.

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Page 1: KEYBOARD INTERFACING Keyboards are organized in a matrix of rows and columns The CPU accesses both rows and columns through ports. Therefore, with two

KEYBOARD INTERFACING • Keyboards are organized in a matrix of

rows and columns The CPU accesses both rows and columns through ports .

• Therefore, with � two 8-bit ports, an 8 x 8 matrix of keys can be connected to a microprocessor

When a key is pressed, a row and a column make a contact

.

Page 2: KEYBOARD INTERFACING Keyboards are organized in a matrix of rows and columns The CPU accesses both rows and columns through ports. Therefore, with two

• Otherwise, there is no connection between rows and columns

• In IBM PC keyboards, a single �microcontroller takes care of hardware and software interfacing

• A 4x4 matrix connected to two ports

The rows are connected to an output port and the columns are connected to an input port

.

Page 3: KEYBOARD INTERFACING Keyboards are organized in a matrix of rows and columns The CPU accesses both rows and columns through ports. Therefore, with two

4x4 matrix

.

Page 4: KEYBOARD INTERFACING Keyboards are organized in a matrix of rows and columns The CPU accesses both rows and columns through ports. Therefore, with two

.

Page 5: KEYBOARD INTERFACING Keyboards are organized in a matrix of rows and columns The CPU accesses both rows and columns through ports. Therefore, with two

.

Page 6: KEYBOARD INTERFACING Keyboards are organized in a matrix of rows and columns The CPU accesses both rows and columns through ports. Therefore, with two

• Identify the row and column of the pressed key for each of the following.

(a) D3 – D0 = 1110 for the row, D3 – D0 = 1011 for the column

(b) D3 – D0 = 1101 for the row, D3 – D0 = 0111 for the column

Solution:(a) The row belongs to D0 and the

column belongs to D2; therefore, key number 2 was pressed.

(b) The row belongs to D1 and the column belongs to D3; therefore, key number 7 was pressed.

.

Page 7: KEYBOARD INTERFACING Keyboards are organized in a matrix of rows and columns The CPU accesses both rows and columns through ports. Therefore, with two

.

Page 8: KEYBOARD INTERFACING Keyboards are organized in a matrix of rows and columns The CPU accesses both rows and columns through ports. Therefore, with two

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