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3.8 Display Modes
3.8.1 Static display example
Figure 3-13 shows how the three-digit LCD panel having the display pattern shown in Figure 3-12 is connected to
the segment signals (S0 to S23) and the common signal (COM0). This example displays data "12.3" in the LCD panel.
The contents of the display data memory (addresses 00H to 17H of LCDSEG) correspond to this display.
The following description focuses on numeral "2." (
panel, it is necessary to apply the select or deselect voltage to the S8 to S15 pins according to Table 3-6 at the timing
of the common signal COM0; see Figure 3-12 for the relationship between the segment signals and LCD segments.
Segment
Common
COM0
According to Table 3-6, it is determined that the bit-0 pattern of the display data memory locations (08H to 0FH of
LCDSEG) must be 10110111.
Figure 3-14 shows the LCD drive waveforms of S11 and S12, and COM0. When the select voltage is applied to
S11 at the timing of COM0, an alternate rectangle waveform, +V
LCD segment.
COM1 to COM3 are supplied with the same waveform as for COM0. So, COM0 to COM3 may be connected
together to increase the driving capacity.
Figure 3-12. Static LCD Display Pattern and Electrode Connections
S
8n+4
S
8n+6
Remark
n = 0 to 2
CHAPTER 3 LCD CONTROLLER/DRIVER
Table 3-6. Select and Deselect Voltages (COM0)
S8
S9
S10
Select
Deselect
Select
S
8n+3
S
8n+2
S
8n+5
S
8n+1
S
8n
S
8n+7
User's Manual U18438EJ2V0UD
) displayed in the second digit. To display "2." in the LCD
S11
S12
S13
Select
Deselect
Select
/−V
, is generated to turn on the corresponding
LCD
LCD
COM0
S14
S15
Select
Select
33
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