Relationship Between Lcd Ram And Display - Renesas H8 Series Hardware Manual

Section 13 LCD Controller/Driver
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.
Bit 7
H'F740 SEG2
SEG32
H'F74F
COM4
Rev. 7.00 Mar 10, 2005 page 428 of 652
REJ09B0042-0700
Bit 6 Bit 5
SEG2 SEG2
SEG32 SEG32
COM3 COM2
Figure 13.3 LCD RAM Map (1/4 Duty)
Bit 4 Bit 3
SEG2 SEG1
SEG32 SEG31 SEG31
COM1 COM4
Bit 2 Bit 1
SEG1 SEG1
SEG31 SEG31
COM3 COM2
Bit 0
SEG1
COM1