UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 709

• Manufacturer Part Number: UPD78F0838
• Description: 8-bit Single-chip Microcontrollers
• Manufacturer: Renesas Electronics Corporation.

17.7.3 Four-time-slice display example
the segment signals (SEG0 to SEG23) and the common signals (COM0 to COM3) of the 78K0/Dx2 chip. This
example displays data "123456.789012" in the LCD panel. The contents of the display data memory (addresses
F9D0H to F9E7H) correspond to this display.
panel, it is necessary to apply the select or deselect voltage to the SEG12 and SEG13 pins according to Table 17-7 at
the timing of the common signals COM0 to COM3; see Figure 17-17 for the relationship between the segment signals
and LCD segments.
SEG12 must contain 1101.
When the select voltage is applied to SEG12 at the timing of COM0, an alternate rectangle waveform, +V
generated to turn on the corresponding LCD segment.
Figure 17-18 shows how the 12-digit LCD panel having the display pattern shown in Figure 17-17 is connected to
The following description focuses on numeral "6." (
According to Table 17-7, it is determined that the display data memory location (F9DCH) that corresponds to
Figure 17-19 shows examples of LCD drive waveforms between the SEG12 signal and each common signal.
Remark
n = 0 to 11
Figure 17-17. Four-Time-Slice LCD Display Pattern and Electrode Connections
SEG
SEG
2n+1
Table 17-7. Select and Deselect Voltages (COM0 to COM3)
2n
Common
COM0
COM1
COM2
COM3
CHAPTER 17 LCD CONTROLLER/DRIVER
Preliminary User’s Manual U19748EJ1V0UD
Segment
) displayed in the seventh digit. To display "6." in the LCD
Deselect
SEG12
Select
Select
Select
COM2
COM0
SEG13
Select
Select
Select
Select
COM1
COM3
LCD
/ V
LCD
707
, is