The keyboard first scans the keyboard and identifies if any key has been pressed. It then sends their relative response of the pressed key to the CPU and vice-a-versa. The Keyboard can be interfaced either in the interrupt or the polled mode. In the Interrupt mode , the processor is requested service only if any key is pressed, otherwise the CPU will continue with its main task.
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WordPress Shortcode. Published in: Education. Full Name Comment goes here. Are you sure you want to Yes No. Chippy Rengan. Show More. No Downloads. Views Total views. Actions Shares. Embeds 0 No embeds. No notes for slide. Figure P BD: Output that blanks the displays. Max is 3 MHz. P CLK: Used internally for timing. P CS: Chip select that enables programming, reading the keyboard, etc. P Shift: Shift connects to Shift key on keyboard. Key Code Format 7. The IRQ line goes high, if anymemory matrix.
The IRQ line goes high, if any changes in sensor valuechanges in sensor value 9. You just clipped your first slide!
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8279 - Programmable Keyboard
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