Datasheet

Table Of Contents
Section 21 LCD Controller/Driver
Rev. 2.00 Jul. 04, 2007 Page 468 of 692
REJ09B0309-0200
21.4.2 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 21.3 to 21.6.
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 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
H'FFF373
H'FFF360
SEG39 SEG39 SEG39 SEG39SEG40 SEG40 SEG40 SEG40
SEG2 SEG2 SEG2 SEG2 SEG1 SEG1 SEG1 SEG1
COM4 COM3 COM2 COM1 COM4 COM3 COM2
COM1
Figure 21.3 LCD RAM Map (1/4 Duty)