GDM2004D-FL-YBW
VER 1.0
8/9
2003/12/09
Instruction table
Instruction code
Instruction
RS
R/W
DB7
DB6
DB5
DB4
DB3
DB2
DB1
DB0
Description
Execution
Time (fosc=
270 KHZ
Clear
Display
0
0
0
0
0
0
0
0
0
1
Write “20H” to DDRA and set
DDRAM address to “00H”
from AC
1.53ms
Return
Home
0
0
0
0
0
0
0
0
1
-
Set DDRAM address to “00H”
From AC and return cursor to
Its original position if shifted.
The contents of DDRAM are
not changed.
1.53ms
Entry mode
Set
0
0
0
0
0
0
0
1
I/D
SH
Assign cursor moving direction
And blinking of entire display
39us
Display ON/
OFF control
0
0
0
0
0
0
1
D
C
B
Set display (D), cursor (C), and
Blinking of cursor (B) on/off
Control bit.
Cursor or
Display shift
0
0
0
0
0
1
S/C
R/L
-
-
Set cursor moving and display
Shift control bit, and the
Direction, without changing of
DDRAM data.
39us
Function set
0
0
0
0
1
DL
N
F
-
-
Set interface data length (DL: 8-
Bit/4-bit), numbers of display
Line (N: =2-line/1-line) and,
Display font type (F: 5x11/5x8)
39us
Set CGRAM
Address
0
0
0
1
AC5
AC4
AC3
AC2
AC1
AC0
Set CGRAM address in address
Counter.
39us
Set DDRAM
Address
0
0
1
AC6
AC5
AC4
AC3
AC2
AC1
AC0
Set DDRAM address in address
Counter.
39us
Read busy
Flag and
Address
0
1
BF
AC6
AC5
AC4
AC3
AC2
AC1
AC0
Whether during internal
Operation or not can be known
By reading BF. The contents of
Address counter can also be
read.
0us
Write data to
Address
1
0
D7
D6
D5
D4
D3
D2
D1
D0
Write data into internal RAM
(DDRAM/CGRAM).
43us
Read data
From RAM
1
1
D7
D6
D5
D4
D3
D2
D1
D0
Read data from internal RAM
(DDRAM/CGRAM).
43us
NOTE: When an MPU program with checking the busy flag (DB7) is made, it must be necessary 1/2fosc is necessary for
executing the next instruction by the falling edge of the “E” signal after the busy flag (DB7) goes to “Low”.
DDRAM address:
Display position
1
2
3
4
5
6
7
8
9
10
11
12 13 14 15 16 17 18 19 20
00 01 02 03 04 05 06 07 08 09 0A 0B 0C 0D 0E 0F 10 11 12 13
40 41 42 43 44 45 46 47 48 49 4A 4B 4C 4D 4E 4F 50 51 52 53
14 15 16 17 18 19 1A 1B 1C 1D 1E 1F 20 21 22 23 24 25 26 27
54 55 56 57 58 59 5A 5B 5C 5D 5E 5F 60 61 62 63 64 65 66 67
DDRAM address
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