13. Dot Matrix LCD Controller (H8/3857 Group)
Rev.3.00 Jul. 19, 2007 page 342 of 532
REJ09B0397-0300
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.
RS
R/
W
STRB
DB7
to DB0
CPU
LCD
controller
SEG1 to SEG64
COM1 to COM32
LCD panel
H8/3857
Figure 13.2 System Block Diagram
Summary of Contents for F-ZTAT H8 Series
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