Datasheet

Section 13 LCD Controller/Driver
Rev. 6.00 Aug 04, 2006 page 444 of 680
REJ09B0145-0600
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.
Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
SEG
2 SEG 2 SEG 2 SEG 2 SEG 1 SEG 1 SEG 1 SEG 1
SEG 40
H'F740
H'F753
SEG
40 SEG 40 SEG 40 SEG 39 SEG 39 SEG 39 SEG 39
COM 4 COM 3 COM 2 COM 1 COM 4 COM 3 COM 2 COM 1
Figure 13.5 LCD RAM Map with Segments Not Externally Expanded (1/4 Duty)