7. COMMAND
28
EPSON
S1D15722D01B000 Technical Manual (Rev.1.1)
7. COMMAND
This IC identifies data bus signal by combination of A0,
___
RD(E), and
___
WR(R/
__
W). Since the command is
interpreted and executed at the internal timing only without relying on the external clock, high-speed processing
is possible.
For the 80 series MPU interface, entering low pulse in the
___
RD pin during read and low pulse in the pin
during write starts the command. When HIGH is entered in the R/
__
W pin, the 68 series MPU interface goes
into the state of read. When LOW is entered, it goes into the state of write. Entering high pulse in the E pin
starts the command (For timing, see 10. TIMING CHARACTERISTICS.) Consequently, the 68 series MPU
interface is different from the 80 series MPU interface in the point that
___
RD(E) becomes “1(H)” during display
data read in the command description and command table. Command description is shown below by taking
the 80 series MPU interface as an example.
When serial interface is selected, sequentially input data from D7.
7.1 Command Description
(1) Display
ON/OFF
This command allows specification of display ON/OFF. Liquid crystal display is performed in
synchronization with display clock input from the built-in oscillation circuit or external source. Do not stop
clock frequency input from the built-in oscillation circuit or external source during display ON.
E R/
__
W
A0
___
RD
___
WR D7 D6 D5 D4 D3 D2 D1 D0
Output
level
0 1 0 1 0 1 0 1 1 1 0
Display
OFF
1
Display ON
* After resetting by the
____
RES pin, the display is set to OFF.
(2) Display
normal/inverted
This command allows inversion of display lighting/non-lighting without rewriting display data RAM. At
this time the contents of the display data RAM are held.
E R/
__
W
A0
___
RD
___
WR D7 D6 D5 D4 D3 D2 D1 D0
Setting
0 1 0 1 0 1 0 0 1 1 0
RAM
data
HIGH
LCD ON voltage level
(normal display)
1
RAM data LOW
LCD ON voltage level
(inverted display)
* After resetting by the
____
RES pin, the display is set to normal display.
(3) Full display lighting ON/OFF
This command allows to forcefully place full display in the state of lighting irrespective of the contents of the
display data RAM. At this time the contents of the display data RAM are held. In combination with the invert
the display command, all-white display is also available.
E R/
__
W
A0
___
RD
___
WR D7 D6 D5 D4 D3 D2 D1 D0
Setting
0 1 0 1 0 1 0 0 1 0 0 State
of
normal
display
1
Full display lighting
* After resetting by the
____
RES pin, the full display lighting is set to OFF.
Содержание S1D15722 Series
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