ST7571 Sitronix Technology, ST7571 Datasheet - Page 28

• Manufacturer Part Number: ST7571
• Description: 4 Gray Scale Dot Matrix LCD Controller/Driver
• Manufacturer: Sitronix Technology

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ST7571
7.5 RESET CIRCUITS
Setting RST to “L” can initialize internal function. RST pin is connected to the reset pin of MPU and initialization by RST pin
is essential before operating. Please note the hardware reset is not same as the software reset. When RST becomes “L”,
the hardware reset procedure will start. When RESET instruction is executed, the software reset procedure will start. The
procedure is listed below:
After power-on, RAM data are undefined and the display status is “Display OFF”. It’s recommended to initialize the whole
DDRAM (ex: fill all 00h or write a display pattern) before turning the Display ON (including the ICON RAM as well). Besides,
the system power is not stable at the time that the power is just turned ON. After the system power is stable, a hardware
reset is required to initialize internal registers.
Ver 1.5a
Clear Serial Counter and Shift Register (if using Serial Interface)
Page Address, P[3:0]=0 (Page 0)
Column Address, X[7:0]=00h (Column 0)
Display ON/OFF, D=0 (Display OFF)
Reverse Display, REV=0 (Normal)
Entire Display ON, EON=0 (Normal)
Icon Control, ION=0 (OFF)
Start Line, S[6:0]=0 (1
COM0, C[6:0]=0 (COM0 Pin)
Display Duty, L[7:0]=0 (1/129)
N-Line, N[4:0]=0 (N-Line OFF)
Power Control, VC=0, VR=0, VF=0 (Internal Power OFF)
Booster Efficiency, BE[1:0]=0,1 (Level 2)
Regulator Resistor, R[2:0]=0,0,0
Contrast Control, EV[5:0]=20h
LCD Bias, BS[2:0]=1,1,1 (1/12 bias)
Frame Rate, FR[3:0]=0,0,0,0 (77Hz)
COM Scan Direction, MY=0 (Normal)
SEG Scan Direction, MX=0 (Normal)
Oscillator Circuit: OFF
Power-Save Mode, P=0 (Release)
Display Data Length, DL[7:0]=00h (for 3-Line serial interface only)
st
line of DDRAM)
Procedure
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Hardware Reset
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
Software Reset
V
V
V
V
X
X
X
X
V
X
X
X
X
X
V
V
X
X
X
X
X
X
2009/7/21