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ST7920 Datasheet(PDF) 17 Page - Sitronix Technology Co., Ltd.

Part No. ST7920
Description  Chinese Fonts built in LCD controller/driver
Download  49 Pages
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Manufacturer  SITRONIX [Sitronix Technology Co., Ltd.]
Direct Link  http://www.sitronix.com.tw
Logo SITRONIX - Sitronix Technology Co., Ltd.

ST7920 Datasheet(HTML) 17 Page - Sitronix Technology Co., Ltd.

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ST7920
V4.0
17/49
2008/08/18
Instruction set 2: (RE=1: extended instruction)
Code
Inst.
RS
RW DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Description
Exec time
(540KHZ)
Standby
0
0
0
0
0
0
0
0
0
1
Enter standby mode, any other instruction can terminate.
COM1
…32 are halted.
72 us
Scroll or
RAM
Address.
Select
0
0
0
0
0
0
0
0
1
SR
SR=1: enable vertical scroll position
SR=0: enable CGRAM address (basic instruction)
72 us
Reverse
(by line)
0
0
0
0
0
0
0
1
R1
R0
Select 1 out of 4 line (in DDRAM) and decide whether to
reverse the display by toggling this instruction
R1,R0 initial value is 0,0
72 us
Extended
Function
Set
0
0
0
0
1
DL
X
1
RE
G
0
DL=1
:8-bit interface
DL=0
:4-bit interface
RE=1: extended instruction set
RE=0: basic instruction set
G=1
:graphic display ON
G=0
:graphic display OFF
72 us
Set Scroll
Address
0
0
0
1
AC5 AC4 AC3 AC2 AC1 AC0 SR=1: AC5~AC0 the address of vertical scroll
72 us
Set Graphic
Display
RAM
Address
0
0
1
0
0
0
AC5
0
AC4
AC3
AC3
AC2
AC2
AC1
AC1
AC0
AC0
Set GDRAM address to address counter (AC)
Set the vertical address first and followed the horizontal
address by consecutive writings
Vertical address range: AC5
…AC0
Horizontal address range: AC3
…AC0
72 us
Note:
1.
Make sure that ST7920 is not in busy state by reading the busy flag before sending instruction or data. If using delay loop instead, please
make sure the delay time is enough. Please refer to the instruction execution time.
2.
“RE” is the selection bit of basic and extended instruction set. After setting the RE bit, the value will be kept. So that the software doesn’t
have to set RE every time when using the same instruction set.


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