NEC PD17062 User Manual
Page 266
266
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PD17062
20.7.2 Vertical Start Position Setting Register
If the vertical start position setting register contains 0H, the vertical start position is set 17 H (interlace) after
the trailing edge of the vertical sync signal. Each time the vertical start position setting register is incremented
by one, the vertical start position shifts down by 1 H; namely the following expression applies.
Vertical start position = 17 H + 1 H
×
(vertical start position setting data)
In Fig. 20-14, position A corresponds to the vertical position setting data 0H. When the vertical position
setting data is changed to 1, the start position shifts down by 1 H, that is position B. (The solid lines indicate
the screen when the vertical position setting data is 0, and the dotted lines, when the vertical position setting
data is 1.
Fig. 20-14 Vertical Shifting
IDC image area
17 H after the trailing edge of the vertical sync signal
A
B