Instructions, Outline, Instruction table – Matrix Orbital MOP-GL12864F User Manual
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Instructions
Outline
The MOP-GL12864F is controlled using a standard SED1520 compliant controller. The display is enabled
by pulling the Enable (E) pin high, communication to and from the device is controlled by pulling the
Read/Write (R/W) line high or low respectively, and the unit may be reset at power up by pulling the
reset (RST) line low. Using Register Select (RS), either the data register or command register is selected
by toggling RS high or low respectively.
Before any data is read or written, the status of the display controller should be read. This is
accomplished by setting RS low, R/W high, E high, and reading the status byte that appears on the data
lines. Each bit of the status word indicates a specific condition, outlined below.
Table 3: Status Bits
Bit
Description
Status
D0
Unused.
Unused.
D1
Unused.
Unused.
D2
Unused.
Unused.
D3
Unused.
Unused.
D4
Reset.
0:Normal, 1:Reset.
D5 Display On/Off. 0:Display On, 1:Display Off.
D6
Unused.
Unused.
D7
Busy status.
0:Ready, 1:Busy.
Instruction Table
Table 4: Parallel Instruction Table
Instruction
Control
Instruction Code
RS R/W DB7 DB6
DB5
DB4
DB3 DB2 DB1 DB0
Display On
0
0
0
0
1
1
1
1
1
1
Display Off
0
0
0
0
1
1
1
1
1
0
Set (Y) Address
0
0
0
1
Y Address
Set (X) Page
0
0
1
0
1
1
1
X Page
Display Start Line
0
0
1
1
Start Line
Status Read
0
1
Busy
0
On/Off Reset
0
0
0
0
Write Display Data
1
0
Write Data
Read Display Data
1
1
Read Data