HD66724 Datasheet, PDF (90/117 Pages) Hitachi Semiconductor – (Graphics LCD Controller/Driver with Key Scan Function)

HD66724/HD66725
Table 44 Relationship between SEGRAM Data and Grayscale Segment Display
(Grayscale Control Segment Driver)
SEGRAM Data
SEGRAM Data
Setting
Effective Applied Voltage ^Setting
Effective Applied Voltage
DB3 DB2 DB1 DB0 for COMS1 Segment
DB7 DB6 DB5 DB4 for COMS2 Segment
0 0 0 0 0 (Always unlit)
0 0 0 0 0 (Always unlit)
0 0 0 1 1 (Always lit)
0 0 0 1 1 (Always lit)
0 0 1 0 0.34 (Grayscale display)
0 0 1 0 0.34 (Grayscale display)
0 0 1 1 0.38 (Grayscale display)
0 0 1 1 0.38 (Grayscale display)
0 1 0 0 0.41 (Grayscale display)
0 1 0 0 0.41 (Grayscale display)
0 1 0 1 0.44 (Grayscale display)
0 1 0 1 0.44 (Grayscale display)
0 1 1 0 0.47 (Grayscale display)
0 1 1 0 0.47 (Grayscale display)
0 1 1 1 0.50 (Grayscale display)
0 1 1 1 0.50 (Grayscale display)
1 0 0 0 (Blink display) *
1 0 0 0 (Blink display) *
1 0 0 1 0.53 (Grayscale display)
1 0 0 1 0.53 (Grayscale display)
1 0 1 0 0.56 (Grayscale display)
1 0 1 0 0.56 (Grayscale display)
1 0 1 1 0.59 (Grayscale display)
1 0 1 1 0.59 (Grayscale display)
1 1 0 0 0.63 (Grayscale display)
1 1 0 0 0.63 (Grayscale display)
1 1 0 1 0.66 (Grayscale display)
1 1 0 1 0.66 (Grayscale display)
1 1 1 0 0.69 (Grayscale display)
1 1 1 0 0.69 (Grayscale display)
1 1 1 1 0.72 (Grayscale display)
1 1 1 1 0.72 (Grayscale display)
Note: Blinking is achieved by repeatedly turning on the segment for 32 frames and turning it off for the next
32 frames.
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