Mike K8LH
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74hct164
There are many many ways to do it. The simple 8-pin interface example below will drive up to 42 displays and the display driver ISR only uses about 5% processor "overhead" (about 50 usecs each 1 msec interrupt). A version with 9-pin interface can drive 56 displays and a version with 10-pin interface can drive 64 displays.
* the driver IC is a Micrel MIC5821 or Allegro A6821. these are 8 bit serial-to-parallel 500-ma sinking driver ICs (overkill in this application).
Regards, Mike
There are many many ways to do it. The simple 8-pin interface example below will drive up to 42 displays and the display driver ISR only uses about 5% processor "overhead" (about 50 usecs each 1 msec interrupt). A version with 9-pin interface can drive 56 displays and a version with 10-pin interface can drive 64 displays.
* the driver IC is a Micrel MIC5821 or Allegro A6821. these are 8 bit serial-to-parallel 500-ma sinking driver ICs (overkill in this application).
Regards, Mike