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Vertical Counter
Posted by
,
15 May 2005
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107 views
The next section is the vertical counter which works just like the horizontal counter. The input to the counter is the HRESET signal from the horizontal counter, so the vertical counter will increment once per horizontal scanline. The vertical counter, resets just like the horizontal, but on a count of 262, 256V + 4V + 1V + 1 (VRESET latched on the next clock pulse).
Only to say that on 7474 (IC labeled E7A) pin 3 , the incoming signal is not the main clock (7.159MHz), but really is the HRESET signal.
Regards,
Mirko