COMMANDS FOR CHARACTER MODULES
Command
RS
Clear
Display
0
Code
R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
0
0
0
0
0
0
0
0
1
Description
Clears the display and returns
the cursor to the home position
(address 0).
Returns the cursor to the home
position (address 0). Also returns
a shifted display to the home
position. DD RAM contents
remain unchanged.
Sets the cursor move direction
and enables/disables the display.
Turns the display ON/OFF (D), or
the cursor ON/OFF (C), and blink
of the character at the cursor
position (B).
Moves the cursor and shifts the
display without changing the DD
RAM contents.
Sets the data width (DL), the
number of lines in the display (L),
and the character font (F).
Sets the CG RAM address. CG
RAM data can be read or altered
after making this setting.
Sets the DD RAM address. Data
may be written or read after mak-
ing this setting.
Reads the BUSY flag (BF) indi-
cating that an internal operation
is being performed and reads the
address counter contents.
Writes data into DD RAM or CG
RAM.
Reads data from DD RAM or CG
RAM.
DD RAM: Display data RAM
CG RAM: Character generator
RAM
A
CG
:
CG RAM Address
A
DD
:
DD RAM Address
Corresponds to cur-
sor address.
AC:
Address counter
Used for both DD
and CG RAM
address.
Execution
Time
82µs~1.64ms
Return
Home
0
0
0
0
0
0
0
0
1
*
40µs~1.64ms
Entry
Mode
Set
Display
ON/OFF
Control
Cursor &
Display
Shift
Function
Set
Set
CG RAM
Address
Set
DD RAM
Address
Read Busy
Flag &
Address
Write Data
to CG or
DD RAM
Read Data
from CG or
DD RAM
0
0
0
0
0
0
0
1
I/D
S
40µs
0
0
0
0
0
0
1
D
C
B
40µs
0
0
0
0
0
1
S/C
R/L
*
*
40µs
0
0
0
0
1
DL
N$ RE
*
#
40µs
0
0
0
1
A
CG
40µs
0
0
1
A
DD
40µs
0
1
BF
AC
1µs
1
0
Write Data
46µs
1
1
Read Data
46µs
Execution times
are typical. If
transfers are
timed by soft-
ware and the
busy flag is not
used, add 10%
to the above
times.
I/D = 1: Increment
I/D = 0: Decrement
S = 1: Accompanies display shift.
S/C= 1: Display shift
S/C = 0: cursor move
R/L= 1: Shift to the right. R/L= 0: Shift to the left.
DL = 1: 8 bits
DL = 0: 4 bits
N = 1: 2 lines
N = 0: 1 line
RE = 1: Ext. Reg. Ena.
F = 0: 5 x 7 dots
BF = 1: Busy
BF = 0: Can accept data
# Set to 1 on 24x4 modules
$ With KS0072 is Address Mode.
Page 48
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