hd66421 Renesas Electronics Corporation., hd66421 Datasheet - Page 42

• Manufacturer Part Number: hd66421
• Description: Ram-provided 160 Channel 4-level Grey Scale Driver For Dot Matrix Graphics Lcd
• Manufacturer: Renesas Electronics Corporation.

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.
MON bit
MON = l: Monochrome display
MON = 0: 4-level gray scale display
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.
Preliminary
Set value
Data bit
Figure 46 Plane Selection Register (R17)
7
6
5
42
DSEL bit
PSEL bit
4
DESL = 1: Plane 1 is displayed
DESL = 0: Plane 0 is displayed
PESL = 1: Access to plane 1 from CPU
PESL = 0: Access to plane 0 from CPU
3
MON
2
DSEL PSEL
1
0
HD66421