HD6473887 Datasheet, PDF (373/523 Pages) Renesas Technology Corp – Hitachi Single-Chip Microcomputer

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.
H'F740
bit7
SEG2
bit6
SEG2
bit5
SEG2
bit4
SEG2
bit3
SEG1
bit2
SEG1
bit1
SEG1
bit0
SEG1
H'F753
SEG40 SEG40 SEG40 SEG40 SEG39 SEG39 SEG39 SEG39
COM4 COM3 COM2 COM1 COM4 COM3 COM2 COM1
Figure 13-5 LCD RAM Map with Segments Not Externally Expanded (1/4 Duty)
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