HD66727 Datasheet, PDF (44/97 Pages) Hitachi Semiconductor – Low-Power Dot-Matrix Liquid Crystal Display Controller/Driver with Key Scan Function

HD66727
ACG:
ADD:
IRE = 1:
KF1, KF0:
CGRAM address (00000–11111)
DDRAM address (0000000–1001011)
Key scan interrupt generation enabled
Key scan cycle set
Reset Function
Initialization by Internal Reset Circuit
The HD66727 is internally initialized by RESET* input. During initialization, the system executes the
instructions as described below. Here, the busy flag (BF) therefore indicates a busy state (BF = 1),
accepting no instruction or RAM data access from the MPU. Here, reset input must be held at least 10 ms.
After releasing power-on reset, clear display instruction is operated. So wait for 1,000 clock-cycles or
more.
Make sure to reset the HD66727 immediately after power-on.
Initialization of Instruction Sets, RAM, and Pins
Instruction set initialization:
1. Clear display executed
Writes 20H to DDRAM after releasing reset.
2. Return home executed
Sets the address counter (AC) to 00H to select DDRAM
3. Start oscillator executed
4. Entry mode set
I/D = 1: Increment by 1
OSC = 0: Clock frequency not divided
5. Cursor control
B/W = 0: White-black inverting cursor off
C = 0: 8th raster-row cursor off
B = 0: Blink cursor off
6. Display on/off control
D = 0: Character/segment display off
FW = 0: 5-dot font width
LC = 0: Line-cursor off
7. Power control
AMP = 0: LCD power supply off
SLP = 0: Sleep mode off
STB = 0: Standby mode off
44