UPD78F9418A NEC, UPD78F9418A Datasheet - Page 221

• Manufacturer Part Number: UPD78F9418A
• Description: (UPD7894xxA) 8-Bit Single Chip Microcontrollers
• Manufacturer: NEC

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14.8.3 Three-time-slice display example
to the segment signals (S0 to S26) and the common signals (COM0 to COM2) of the µ PD789407A or 789417A
Subseries chip. This example displays data "123456.789" in the LCD panel. The contents of the display data
memory (addresses FA00H to FA1AH) correspond to this display.
panel, it is necessary to apply the select or deselect voltage to the S9 to S11 pins according to Table 14-9 at the
timing of the common signals COM0 to COM2; see Figure 14-15 for the relationship between the segment signals
and LCD segments.
must contain x110.
signal in the 1/2 and 1/3 bias methods, respectively. When the select voltage is applied to S9 at the timing of COM1
or COM2, an alternate rectangle waveform, +V
Figure 14-16 shows how the nine-digit LCD panel having the display pattern shown in Figure 14-15 is connected
The following description focuses on numeral "6." (
According to Table 14-9, it is determined that the display data memory location (FA09H) that corresponds to S9
Figures 14-17 and 14-18 show examples of LCD drive waveforms between the S9 signal and each common
Remark
n = 0 to 8
Figure 14-15. Three-Time-Slice LCD Display Pattern and Electrode Connections
S
3n+2
Table 14-9. Select and Deselect Voltages (COM0 to COM2)
S
3n+1
Common
COM0
COM1
COM2
CHAPTER 14 LCD CONTROLLER/DRIVER
S
Segment
3n
User’s Manual U13952EJ3V0UD
LCD
/−V
LCD
Deselect
, is generated to turn on the corresponding LCD segment.
Select
Select
S9
) displayed in the fourth digit. To display "6." in the LCD
Select
Select
Select
S10
Select
Select
S11
COM2
−
COM0
COM1
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