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7.4 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 D0 A3D1
A2
A4A5
A1
A0
D3
D2
D4D5
D6D7
D0D1
00X000
00
000
1
XXX
Character code
CGRAM address
CGRAM
data
000
001
010
011
100
101
110
111
000
1
000
1
1
CGRAM
000
0
00
00
00
00
0000 001 0X
0
11
1
11
0
1
1
1
1
0
0
0
0
00
1
1000X
1
1
0
0
0
XX
1
0
000
0
1 0
000
0
000
1
CGRAM
0
000
0
XX0
011101
1
X000
01
001
0
0
0
0
1
1
1
1
110
111
X0
0
0
1
1
0
000
0
0
CGRAM
000
000
0
0
0
0
0
000
1
(1)
(2)
(8)
1
1
1
1
0
0
0
0
1
0
0
1
1
0
1
1
1
1
1
1
1
1
1
0
0
0
1
1
0
0
0
1
1
1
1
1
0
x = don't care
7.5 INSTRUCTIONS
Instruction RS R/W DB7
DB6 DB5 DB4 DB3 DB2 DB1 DB0
Clear display
0000000001
Cursor home
000000001x
Entry mode set
00000001I/DS
Display on/off control
0000001DCB
Cursor/display shift
000001S/CR/Lxx
Function set
00001DLNxBR1BR0
CGRAM address set
0001
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
x = don’t care
1
1
1
1
1
1
1 0
1
1
1
1
1
1
1
1
1
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M0420SD-204SDAR1-3
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