UPD78F0838 Renesas Electronics Corporation., UPD78F0838 Datasheet - Page 698

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

17.6 Common and Segment Signals
segment signals becomes higher than a specific voltage (LCD drive voltage, V
potential difference becomes lower than V
problem, this LCD panel is driven by AC voltage.
696
Each pixel of the LCD panel turns on when the potential difference between the corresponding common and
Applying DC voltage to the common and segment signals of an LCD panel causes deterioration. To avoid this
(1)
Common signals
Each common signal is selected sequentially according to a specified number of time slices at the timing
listed in Table 17-3. In the static display mode, the same signal is output to COM0 to COM3.
In the three-time-slice mode, leave the COM3 pin open.
Number of
Time Slices
Static display mode
Three-time-slice mode
Four-time-slice mode
COM Signal
CHAPTER 17 LCD CONTROLLER/DRIVER
Preliminary User’s Manual U19748EJ1V0UD
LCD
.
Table 17-3. COM Signals
COM0
COM1
COM2
LCD
). The pixels turn off when the
COM3
Open