ST7577 Sitronix Technology, ST7577 Datasheet - Page 22

• Manufacturer Part Number: ST7577
• Description: Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

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ST7577
8. RESET CIRCUIT
Setting RESB to “L” can initialize internal function. While RESB is “L”, no instruction except read status can be accepted.
The initialization by RESB is essential before using.
When RESB becomes “L”, the following procedures will start.
Fix COM/SEG outputs at V
.
SS
Page address: Y[2:0]=0
Column address: X[7:0]=0
COM Scan Direction MY=0
SEG Select Direction XD=1
Data Format: MLB=MLB pin setting
Power down mode: PD=1
Initial V0 setting: V
[6:0]=0
OP
Display control: Display Blank: D=E=0
Normal instruction set: H=0
Frame Rate = 73Hz. FR[2:0]=011b
Duty selection: Depends on DTY pin setting.
Booster setting: BE=0, PC[1:0]=01b (Booster Efficiency Level 2, Booster X3)
Bias system: BS[1:0]=[0,0] (1/7 Bias)
After power-on, RAM data are undefined and the Display status is “Blank”. It’s better to initialize whole DDRAM (fill all 00h
or write the display pattern) before turning the Display ON.
Ver 1.0a
22/48
2008/02/14