PEDL9044-03
1
Semiconductor
ML9044-xxA/xxB
Display Data RAM (DDRAM)
This RAM stores the display data represented in 8-bit character coding (see Table 2).
The DDRAM addresses correspond to the display positions (digits) of the LCD as shown below. The DDRAM
addresses (to be set in the ADC) are represented in hexadecimal.
DB6 DB5 DB4 DB3 DB2 DB1 DB0
ADC
MSB
LSB
Hexadecimal
Hexadecimal
(Example) Representation of DDRAM address = 12
ADC
0
0
1
0
0
1
0
1
2
1) Relationship between DDRAM addresses and display positions (1-line display mode)
Digit
1
Display position
2
3
4
5
23 24
16 17
DD RAM address (hexadecimal)
00 01 02 03 04
Left
end
Right
end
In the 1-line display mode, the ML9044 can display up to 24 characters from digit 1 to digit 24. While the
DDRAM has addresses “00” to “4F” for up to 80 character codes, the area not used for display can be used as a
RAM area for general data. When the display is shifted by instruction, the relationship between the LCD
display and the DDRAM address changes as shown below:
Digit
1
2
3
4
23 24
15 16
(Display shifted to the right)
4F 00 01 02
Digit
1
2
3
4
5
23 24
17 18
(Display shifted to the left) 01 02 03 04 05
16/60
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