HD66421 Datasheet, PDF (11/46 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
System Description
while the other plane is being written. The
HD66421 can reduce power dissipation without
The HD66421 can display a maximum of 160 x affecting display because data is retained in the
100 dots (ten 16x16-dot characters x 6 lines) display RAM even during standby modes. An
four-level gray scale or four colour LCD panel. LCD system can be configured simply by
Four levels of gray scale can be selected from attaching external power supply, capacitors and
32-levels, so the appropriate 4-level gray scale can resistors (figure 1) since the HD66421
be displayed. And Monochrome display can be incorporates power circuits.
selected from two planes. One plane is displayed
MPU
LCD panel
COM1 to
COM50
SEG1 to
SEG160
CS
RS
RD
HD66421
WR
DB7 to DB0
8
Figure 1 System Block Diagram
COM51 to
COM100
DC/DC
Convertor
11