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4-3-1 CHARACTER GENERATOR RAM (CGRAM)
The CGRAM stores the pixel information (1 = pixel on, 0 = pixel off) for the eight user-
definable 5x8 characters. Valid CGRAM addresses are 00H to 3FH. CGRAM not being used to
define characters can be used as general purpose RAM (lower 5 bits only). Character codes 00H
to 07H (or 08H to 0FH) are assigned to the user-definable characters (see section 5.0 Character
Font Tables). The table below shows the relationship between the character codes, CGRAM
addresses, and CGRAM data for each user-definable character.
D7
D3D4D5D6
D2 D0D1
A3
A2
A4A5
A1
A0
D3
D2
D4D5
D6D7
D1
D0
X
0000
000
X X X
Character code
CGRAM address
CGRAM data
00
0000
0 0 1
0 1 0
0 1 1
1 0 0
1 0 1
1 1 0
1 1 1
0
00
0
00
0
00
0
0 000
0 000
0 0 0 0 0 0 1 0X
11
1
11
0
1
1
1
1
0
0
0
0
00
1
1 0 0
0
1
1
0
0
0
X
0
XX
0
0
0
0
0
0 0 0
0
0 0 0
0
0 00
0
1
X
0000
111
1 001
0 0
0
0
0
0
1
1
1
1
1 1
1 1
X XX
0
0
0
0
1
1
1
1
0
0 00
0 00
0 00
0 0
0 00
0
x = don't care
4-3-2 INSTRUCTIONS
Instruction
RS
R/W
DB7 DB6 DB5 DB4 DB3 DB2 DB1 DB0
Clear display
0 0 0 0 0 0 0 0 0 1
Cursor home
0 0 0 0 0 0 0 0 1 x
Entry mode set
0
0
0
0
0
0
0
1
I/D
S
Display on/off control
0 0 0 0 0 0 1
D
C B
Cursor/display shift
0 0 0 0 0 1
S/C
R/L
x x
Function set
0 0 0 0 1
DL
N
x
BR1 BR0
CGRAM address set
0 0 0 1
CGRAM address
DDRAM address set
0 0 1
DDRAM address
Address counter read
0 1
BF=0
AC contents
DDRAM or CGRAM write
1 0
Write data
DDRAM or CGRAM read
1 1
Read data
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