Specifications

10–12 EPSON
SED1280
1278 instruction register
The following table shows the 1278 instructions.
The control bit functions are shown in the following
table.
Instruction
Code
Cycles Description
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Clears the entire display and
Display Clear 000000011640 resets the display data RAM
address counter.
Resets the display data RAM
address counter and returns a
Cursor Home 0000001× 1640 shifted display to its original
position. The RAM contents are
not changed.
Set Entry Mode 000001I/DS 40
Enables the display shift and
sets the display shift direction.
Bit D enables/disables the entire
screen, bit C enables/disables
Display Attributes 00001DCB 40the cursor and bit B enables/
disables character blinking at the
cursor position.
Shifts the display when a cursor
Cursor/display Shift 0001S/CR/L×× 40 move that does not alter the
display data RAM occurs.
Bit iF sets the interface data
System Setup 0 0 1 IF N F ×× 40 length, bit N the number of
display rows, and bit F, the font.
Sets. the CGRAM address.
Select CGRAM 0 1 Character generator RAM address 40 Successive write instructions will
address CGRAM.
Sets the DDRAM address.
Select DDRAM 1 Display data RAM address 40 Successive write instructions will
address DDRAM.
Note: × = don’t care
Control Function
bit 0 1
I/D Decrement Increment
S No display shift Disply shift
S/C Cursor movement Display shift
R/L Left shift Right shift
IF 4-bit interface 8-bit interface
N One row Two rows
F5 × 7 pixels 5 × 10 pixels
1278 data register
This register is used for writing data to the 1278 display
data (DD) RAM and character generator (CG) RAM.
Data is written to DDRAM when a Select DDRAM
instruction is executed before a Select CGRAM
instruction, and written to CGRAM when a Select
CGRAM instruction is executed.