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13. Dot Matrix LCD Controller (H8/3857 Group)
13.3
Operation
13.3.1
System Overview
The LCD controller operates at 1/32, 1/16, or 1/8 duty. The display size is a maximum of 40 × 32
dots (4 rows of 8 columns with a 5 × 8-dot font). As the LCD controller operates on the subclock
to perform display control, the time, etc., can be constantly displayed. As this module includes a
built-in 2X or 3X LCD power supply step-up circuit, an LCD system can be configured with just a
few external parts (resistors and capacitors). Also, since data in the display RAM is retained even
in module standby mode, and step-up operation is not performed, low power consumption can be
achieved without affecting the display.
H8/3857
CPU
Rev.3.00 Jul. 19, 2007 page 342 of 532
REJ09B0397-0300
RS
R/W
LCD
STRB
controller
DB7
to DB0
Figure 13.2 System Block Diagram
SEG1 to SEG64
COM1 to COM32
LCD panel
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