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HT1647 Datasheet(PDF) 11 Page - Holtek Semiconductor Inc |
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HT1647 Datasheet(HTML) 11 Page - Holtek Semiconductor Inc |
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11 / 24 page  HT1647 11 April 21, 2000 Name Command Code Function FRAME 170Hz X100-0001-1000-XXXX Select 170Hz frame frequency and active segment signal width can be divided into 13 sections FRAME 89Hz X100-0001-1101-XXXX Select 89Hz frame frequency and active segment sig- nal width can be divided into 24 sections Frame frequency selection command code factory gray scale in every level. HT1647 provides 5-bit PWM data to control the length of the sec- tion. In other words, a max. 24 gray scales are gen- erated by 5-bit binary PWM data. At FRAME 89Hz mode, the HT1647 only provides a max. of 24 adjustable gray scales although 32 is the ex- pressed max. value by 5 bits binary code. When 5 bits binary code value is more than 23, the PWM control circuit uniformly regards 23. To increase PWM data indicates to increase the length of the active segment signal. The varied length of the ac- tive segment signal displays varied gray scale in TN-type, STN-type LCDs (refer to table 1). Simi- larly, it displays varied color in ECB-type LCDs. The color display is derived from ECB-type LCD specification. At FRAME 170Hz mode, the HT1647 only provides a max. of 13 adjustable gray scales although 32 is the expressed max. value by 5 bits binary code. When the 5 bits bi- nary code value is more than 12, the PWM con- trol circuit uniformly regards 12. The user must appoint four kinds of PWM data to four kinds of different gray scale level by commanding PWM data (refer to table 2). Name Command Code Function GRS LEVEL 1 X100-001 B4-B3 B2 B1 B0-XXXX Set PWM data in gray scale level 1 GRS LEVEL 2 X100-010 B4-B3 B2 B1 B0-XXXX Set PWM data in gray scale level 2 GRS LEVEL 3 X100-011 B4-B3 B2 B1 B0-XXXX Set PWM data in gray scale level 3 GRS LEVEL 4 X100-100 B4-B3 B2 B1 B0-XXXX Set PWM data in gray scale level 4 Four kinds of gray scale level command code |
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