HD66421 Datasheet, PDF (42/46 Pages) Hitachi Semiconductor – (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)

Preliminary
Rev. 1.1E '99.02.10
HD66421
Plane Selection Register (R17): The plane
selection register (figure 46) controls general
operations of the HD66421. Each bit has its own
function as described below.
DSEL bit
DESL = 1: Plane 1 is displayed
DESL = 0: Plane 0 is displayed
MON bit
MON = l: Monochrome display
MON = 0: 4-level gray scale display
PSEL bit
PESL = 1: Access to plane 1 from CPU
PESL = 0: Access to plane 0 from CPU
Data bit
Set value
7
6
5
4
3
2
1
0
MON DSEL PSEL
Figure 46 Plane Selection Register (R17)
Note
When you use the monochrome display, you have to initialize the x-address to even
number before access to display RAM. And you alway have to use even number.
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