Friday, February 13, 2009

Serial to Parallel Shift Register

To expand the I/O of a microcontroller, one can use a serial-in-parallel-out shift register to convert serial signals to a parallel output. Useful to control HD44780 type parallel LCD modules using only 3 wires (one for enable one, one for the shift register data, one for the shift register clock). The shift register would control the LCD in 4 bit mode with another bit for RS).

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