HD6433802H Datasheet, PDF (324/435 Pages) Hitachi Semiconductor – 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 are shown in figures 13.3 to 13.6.
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'F74C
SEG25 SEG25 SEG25 SEG25
COM4
COM3 COM2 COM1 COM4 COM3
Figure 13.3 LCD RAM Map (1/4 Duty)
COM2
COM1
306