To understand how a keypad functions as a raster scan input device and to learn how to interface a keypad to a microprocessor. • To understand how to control an LCD panel and to interface it to a microprocessor. (Normally, an LCD can be used directly as a memory-mapped I/O device, but due to current limitations of the 68HC12, a buffer will be used between the 68HC12’s data bus and the LCD panel.)

lab5_u07_keypad_lcd_intr.pdf

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