hd66740 Renesas Electronics Corporation., hd66740 Datasheet - Page 36

• Manufacturer Part Number: hd66740
• Description: 112 X 80-dot Graphics Lcd Controller/driver - Hitachi Semiconductor
• Manufacturer: Renesas Electronics Corporation.

HD66740
Reset Function
The HD66740 is internally initialized by RESET input. The reset input must be held for at least 1 ms.
Instruction Set Initialization:
RAM Data Initialization:
1. CGRAM
Output Pin Initialization:
1. LCD driver output pins (SEG/COM): Outputs GND level
2. Booster output pins (VLOUT): Outputs GND level
3. Oscillator output pin (OSC2): Outputs oscillation signal
1.
2.
3.
4.
5.
6.
7.
8.
9.
10. 1/64-divided clock boost (DCC = 0)
11.
This is not automatically initialized by reset input but must be initialized by software while display is
off (D = 0).
Start oscillation executed
Driver output control (SGS = 0, CMS = 0)
Power control (AMP = 0: LCD power off, SLP = 0: Sleep mode off, STB = 0: Standby mode off)
Three times boost (BT1/0 = 00), 1/10 bias drive (BS2/1/0 = 000), Weak contrast (CT5-0 = 00000)
Entry mode set (REV = 0: Normal display, I/D = 1: Increment by 1, RDM = 0: Automatically
update after reading)
Display on/off control (D = 0: Display off, CEN = 0: Normal position)
Display line control (NL3/2/1/0 = 1001: 1/80 duty ratio)
Double-height display off (DL10–1 = 0000000000)
Vertical scroll control (SN3/2/1/0 = 0000: First line displayed at the top, SL2/1/0: First raster-row
displayed at the top of the first line, PS1/0 = 00: Partial scroll off)
B-pattern waveform AC drive (B/C = 0, EOR = 0, NW4/3/2/1/0 = 00000)
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