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CHAPTER 18 LCD CONTROLLER/DRIVER
User’s Manual U15798EJ2V0UD
18.8 Display Modes
18.8.1 Static display example
Figure 18-14 shows the connection of a static type 1-digit LCD panel with the display pattern shown in Figure 18-
13 with the segment (S0 to S11) and common (SCOM0) signals. The display example is “5,” and the display data
memory contents (addresses FA00H to FA07H) correspond to this.
In accordance with the display pattern in Figure 18-13, selection and non-selection voltages must be output to pins
S0 to S7 as shown in Table 18-7 at the SCOM0 common signal timing. At this time, set the SDSEL3 register to 03H
to set the S0 to S7 pins to the static display mode.
Table 18-7. Selection and Non-Selection Voltages (SCOM0)
Segment
S0
S1
S2
S3
S4
S5
S6
S7
Common
SCOM0
NS
S
NS
S
S
S
NS
S
S: Selection, NS: Non-selection
From this, it can be seen that 01011101 must be prepared in bit 0 of the display data memory (addresses FA00H
to FA07H) corresponding to S0 to S7.
The LCD drive waveforms for S1, S2, and SCOM0 are shown in Figure 18-15. When S1 is at the selection voltage
at the timing for selection with SCOM0, it can be seen that the +V
LCD
/–V
LCD
AC square wave, which is the LCD
illumination (ON) level, is generated.
Figure 18-13. Static LCD Panel Display Pattern and Electrode Connections
S3
S2
S5
S1
S0
S4
S6
S7
SCOM0