Specifications

EPSON 8–63
SED1240 Series
SED1240
Series
Example of Setting the Instructions
(Reference)
(1) Initialization
This IC has no power-on reset function when power
is turned on. Accordingly, the IC internal status is
indefinite when the power has been turned on. Be
sure to initialize the system. If electric charge remains
in the smoothing capacitor connected between the
liquid crystal drive voltage output terminal (V
1 to
V
5) and VDD terminal, such a trouble as temporary
blackening will occur when power is turned on. To
avoid such a trouble, follow the steps given below:
Note 0 : (0) is a NOP command. This command has a
function to clear the test mode. After resetting,
it is recommended to execute this command
several times before starting input. It is also
recommended to execute it on a periodic basis
at a proper position of the insutruction.
Note 1: (7) denotes RAM initialization. Set the contents
to be displayed in the beginning. For items not
to be displayed (RAM clear), use the following
steps:
- DDRAM - write 20H (character code).
- CGRAM - write 00H (data "0").
- Symbol register - write 00H (data "0").
The RAM data is unspecified at the time of RES
input (after power is turned on). If the data "0"
is not written at this stage, unexpected display
may occur to the unset position.
Note 2: Defined by the rising characteristics of the
boosting circuit, power regulating circuit and
voltage and follower circuit, time setting varies
according to the external capacity. So be sure
to make confirmation by external capacity, and
set this time.
Note 3: The dynamic drive system display lamp is lit up
by the display on/off command when it is on.
The static icon lamp is lit by the static icon control
command. So to light up the lamp simultaneously
with start of display, execute the display on/off
control command and static icon control within
one frame.
Note 4: Static icon control must be operated when the
oscillating circuit is on. (This is mandatory.)
Note 5: (0) to (8) must be performed when display is off.
Turn on V
DD -V SS power when RES terminal="L".
Power stabilizes.
After power and input level to this IC have been
stabilized, change RES "L" to RES "H" subsequent to
t
RW holding. (Reset clear)
Command state (initial state)
"See this specification No.21".
Wait for 20 microseconds or more
Command input:Asterisked items (*) are in no
particular order.
(0) NOP(Note 0)
(1) System set
(2) Power save control
-PS : off(power save)
-O : on(oscillating circuit)
(*) Line scroll control set
(*) Line blink vertical double size display
control set
(*) power control set
-IRS,BAS,IRI,IRO
(*) Electronic volume resistor set
-Address :00H -Data (* ,* ,* ,* ,*)
(7) RAM set (Note 1)
-RAM address set
-Data write
(8) Power circuit ON
Wait for 500 microseconds or more. (Note 2)
Display ON )D=1) (Note 3)
(10) Static icon control (Notes 3 and 4)
-Address : 00H -Data (* ,* ,* ,* ,*)
-Address : 01H -Data (* ,* ,* ,* ,*)
-Address : 02H -Data (* ,* ,* ,* ,*)
-Address : 03H -Data (* ,* ,* ,* ,*)
End of initializarion