UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 703

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

17.7 Display Modes
17.7.1 Static display example
to the segment signals (SEG0 to SEG23) and the common signal (COM0) of the 78K0/Dx2 chip. This example
displays data "12.3" in the LCD panel. The contents of the display data memory (F9D0H to F9E7H) correspond to this
display.
panel, it is necessary to apply the select or deselect voltage to the SEG8 to SEG15 pins according to Table 17-5 at
the timing of the common signal COM0; see Figure 17-11 for the relationship between the segment signals and LCD
segments.
F9DFH) must be 10110111.
applied to SEG11 at the timing of COM0, an alternate rectangle waveform, +V
corresponding LCD segment.
together to increase the driving capacity.
Figure 17-12 shows how the three-digit LCD panel having the display pattern shown in Figure 17-11 is connected
The following description focuses on numeral "2." (
According to Table 17-5, it is determined that the bit-0 pattern of the display data memory locations (F9D8H to
Figure 17-13 shows the LCD drive waveforms of SEG11 and SEG12, and COM0. When the select voltage is
COM1 to COM3 are supplied with the same waveform as for COM0. So, COM0 to COM3 may be connected
Remark
Common
COM0
n = 0 to 2
Segment
SEG
SEG
Figure 17-11. Static LCD Display Pattern and Electrode Connections
8n+6
8n+4
SEG8
Select
Table 17-5. Select and Deselect Voltages (COM0)
SEG
SEG
8n+7
CHAPTER 17 LCD CONTROLLER/DRIVER
Deselect
SEG9
8n+3
Preliminary User’s Manual U19748EJ1V0UD
SEG10
SEG
SEG
SEG
SEG
Select
8n+2
8n+5
8n+1
8n
) displayed in the second digit. To display "2." in the LCD
SEG11
Select
Deselect
SEG12
COM0
LCD
SEG13
Select
/ V
LCD
, is generated to turn on the
SEG14
Select
SEG15
Select
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