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November 09, 2005
Shift Registers, A6818xA
Shift registers are a type of sequential logic circuit, mainly for storage of digital data. They are a group of flip-flops connected in a chain so that the output from one flip-flop becomes the input of the next flip-flop. Most of the registers possess no characteristic internal sequence of states. All the flip-flops are driven by a common clock, and all are set or reset simultaneously.
There are different shift registers such as Serial In - Serial Out, Serial In - Parallel Out, Parallel In - Serial Out, Parallel In - Parallel Out, and bidirectional shift registers. There is also a special form of counter - the shift register counter.
Thanks to Todd H (WE LOVE YOU TODD!), I was able to get hold of the A6818 shift registers to experiment with.
Essentially, there are 5 important pins on the shift register. The 2 power, logic supply, Serial Data In, the Strobe pin, the Clock pin and the Ground pin. . Here is the code from Todd H and code from Mluck.
The connections to the PIC.
Posted by min at November 9, 2005 12:31 PM