13.3.2
Relationship between LCD RAM and Display
The relationship between the LCD RAM and the display segments differs according to the duty
cycle. LCD RAM maps for the different duty cycles with the segment not externally expanded are
shown in figures 13-5 to 13-8, and ones with the segments externally expanded are shown in
figures 13-9 to 13-12.
After setting the registers required for display, data is written to the part corresponding to the duty
using the same kind of instruction as for ordinary RAM, and display is started automatically when
turned on. Word- or byte-access instructions can be used for RAM setting.
bit7
bit6
bit5
bit4
bit3
bit2
bit1
bit0
H'F740
SEG2
SEG2
SEG2
SEG2
SEG1
SEG1
SEG1
SEG1
SEG40
COM4
SEG40
COM3
SEG40
COM2
SEG40
COM1
SEG39
COM4
SEG39
COM3
SEG39
COM2
SEG39
COM1
H'F753
Figure 13-5 LCD RAM Map with Segments Not Externally Expanded (1/4 Duty)
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ETC [ ETC ]
