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PmodCLP Reference Manual
Instruction
RS R/W DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Clear
0
0
Display
Return
0
0
Home
Entry mode
0
0
set
Display
ON/OFF
0
0
control
Cursor or
0
0
Display shift
Function Set
0
0
Set CGRAM
0
Address
Set DDRAM
0
address
Read busy
0
flag/address
Write data to
1
RAM
Read data
1
from RAM
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Table 3. LCD Instructions and Codes
Instruction bit assignments
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
0
1
0
0
1
DL
0
0
1
AC5 AC4 AC3 AC2 AC1 AC0
0
1
AC6 AC5 AC4 AC3 AC2 AC1 AC0
1
BF
AC6 AC5 AC4 AC3 AC2 AC1 AC0
0
D7
D6
D5
1
D7
D6
D5
0
0
0
0
0
1
0
1
I/D
1
D
C
S/C
R/L
X
N
F
X
D4
D3
D2
D1
D4
D3
D2
D1
Digilent, Inc.
www.digilentinc.com
Description
Clear display by writing a 20H to
all DDRAM locations; set DDRAM
1
address register to 00H; and
return cursor to home.
Return cursor to home (upper left
corner), and set DDRAM address
X
to 0H. DDRAM contents not
changed.
I/D = '1' for right-moving cursor
and address increment; SH = '1'
SH
for display shift (direction set by
I/D bit).
Set display (D), cursor (C), and
B
blinking cursor (B) on or off.
S/C = '0' to shift cursor right or
X
left, '1' to shift entire display right
or left (R/L = '1' for right).
Set interface data length (DL = '1'
for 8 bit), number of display lines
X
(N = '1' for 2 lines), display font (F
= '0' for 5x 8 dots)
Set CGRAM address counter
AC5 – AC0
Set DDRAM address counter
AC6 – AC0
Read busy flag (BF) and address
counter AC6 – AC0
Write data into DDRAM or
D0
CGRAM, depending on which
address was last set
Read data from DDRAM or
D0
CGRAM, depending on which
address was last set
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