NEC PD17062 - Manual (Page 267)

267
µ
PD17062
The vertical start position of the display character is determined by the vertical start position register. At
this point, the vertical start position (number of horizontal scan lines) depends on the state of the V SYNC and
H SYNC signals supplied to the
µ
PD17062, as shown in Fig. 20-15. In other words, the first H SYNC signal that comes
after the V
SYNC
signal rises is counted as 1 H.
Fig. 20-15 Counting the Vertical Start Position
V SYNC
H
SYNC
H
SYNC
#
#
$
$
%
%
Each circled number corresponds to the number of scan lines.