NEC PD17062 User Manual
Page 265
265
µ
PD17062
20.7.1 Horizontal Start Position Setting Register
If the horizontal start position setting register contains 0H, the horizontal start position is set 4.25
µ
s after
the trailing edge of the horizontal sync signal. Each time the horizontal start position setting register is
incremented by one, the horizontal start position shifts to the right by 250 ns; namely the following expression
applies.
Horizontal start position = 4.25
µ
s + 250 ns
×
(horizontal start position setting data)
In Fig. 20-13, position A corresponds to the horizontal position setting data 0H. When the horizontal position
setting data is changed to 1, the start position shifts to the right by 250 ns (one dot of the minimum-size
character), that is position B. (The solid lines indicate the screen when the horizontal position data is 0, and
the dotted lines, when the horizontal position data is 1.
Fig. 20-13 Horizontal Shifting
IDC image area
4.25
A
B
after trailing edge of horizontal synchronizing signal
s
µ