FEDL87V3104-03
OKI Semiconductor
ML87V3104
2.3 Display functions
2.3.1 Main screen, sub-screen, and scrolling
The main screen and the sub-screen in the display screen (see Fig. F2.2.1) can respectively display the areas
specified in the display memory. (Fig. F2.3.1)
Origin
(2)
(1)
Display memory
LCD Screen
(4)
Main screen
Sub-screen
(3)
Fig. F2.3.1 The display screen composition
•
Control registers:
(1) MDPSTX [#31h, #30h]:
(2) MDPSTY [#33h, #32h]:
(3) SDPSTX [#35h, #34h]:
(4) SDPSTY [#37h, #36h]:
(5) MDPPGA [#38h]:
(6) SDPPGA [#39h]:
Starting horizontal address of reading out the main screen display area
Starting vertical address of reading out the main screen display area
Starting horizontal address of reading out the sub-screen display area
Starting vertical address of reading out the sub-screen display area
Page number of the main screen display area
Page number of the sub-screen display area
The starting addresses of reading out the display memory can be specified for the separate main screen and
sub-screen in units of 16 horizontal pixels and one vertical line. In addition, by successively over-writing by the
host CPU, it is possible to realize scrolling of the display screen.
The sub-screen is always displayed by superimposing on the main screen.
9/69
OKI [ OKI ELECTRONIC COMPONETS ]
