Relationship Between Lcd Ram And Display - Hitachi H8S/2646 Hardware Manual

18.3.2

Relationship between LCD RAM and Display

H8S/2646, H8S/2646R, H8S/2645
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 18-3 to 18-6.
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.
Bit 7
H'FC40
H'FC47
SEG2 SEG2
H'FC48
H'FC53 SEG24 SEG24 SEG24 SEG24 SEG23 SEG23 SEG23 SEG23
COM4 COM3
Bit 6 Bit 5 Bit 4
SEG2 SEG2
COM2 COM1 COM4 COM3 COM2 COM1
Figure 18-3 LCD RAM Map (1/4 Duty)
Bit 3 Bit 2 Bit 1
SEG1 SEG1 SEG1
Bit 0
Space not used
for display
SEG1
Display space
643