Re: Simple Clockable Decoder Chip
- From: Jim Granville <no.spam@xxxxxxxxxxxxxxxxxxxxxx>
- Date: Wed, 07 May 2008 10:35:04 +1200
Tomás Ó hÉilidhe wrote:
Only one pin is needed from the microcontroller.
With the shift register setup, two pins are needed (one for clock, one
for data input).
You can make a vanilla OneWire Shift-Register interface, by using a
RC on the Data pin, and pulse-width varying the clock.
Assuming a Positive edge Clock :
A narrow clock Low time, loads a HI on the rising edge
(D Pin is still hi),
a Wider clock LOW time, loads a LOW on the rising edge
(D pin has had time to follow the clock Lo)
Shft registers are very common, and you have a choice of drive-currents.
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