Specifications

4–22 EPSON
SED1220
VF = 0 : Voltage follower off
1 : Voltage follower on
VC = 0 : Voltage regulation circuit off
1 : Voltage regulation circuit on
(5) System Set
This command is used for selecting display line,
common shift direction and use/non-use of CR
RAM.
When power on or resetting is done, execute this
command first.
N2, N1 = 0, 0 : 2lines
N2, N1 = 0, 1 : 3lines
S = 0 : COM left shift
= 1 : COM right shift
CG = 0 : Use CG RAM
1 : Does not use RAM
A0 WR D7 D6 D5 D4 D3 D2 D1 D0
00 0110
N1 N2
SCG
∗ : Don't Care
(6) RAM Address Set
This command sets addresses to write data into the
DD RAM, CG RAM and symbol register in the
address counter.
When the cursor is displayed, the cursor is dis-
played at the display position corresponding to the
DD RAM address set by this command.
1
The settable address length is ADDRESS = 00H to
7FH.
2
Before writing data into the RAM, set the data
write address by this command. Next, when data is
written in succession, the address is automatically
incremented.
RAM Map
ADDRESS
A0 WR D7 D6 D5 D4 D3 D2 D1 D0
00 1
0 0 H
1 0 H
2 0 H
3 0 H
4 0 H
5 0 H
6 0 H
7 0 H
0123456789ABCDEF
C G R A M (0 0 H)
C G R A M (0 2 H)
C G R A M (0 1 H)
C G R A M (0 3 H)
EV Test
Unused
"
"
"
"
For signals
DDRAM line 1
DDRAM line 2
DDRAM line 3
Symbol register
Symbol register
–
For signals
For symbol register
SI
EV
Test
SI
:Static icon register
:Electronic volume register
:Test register (Do not use)
:Unused
:Output from SEGS1 to SEGS2, SEGS4, SEGS5
:Output from COMS1 to COMS2.