UPD78F1502AGK-GAK-AX Datasheet, PDF (722/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 16 LCD CONTROLLER/DRIVER
Figure 16-33. Examples of LCD Drive Power Connections (Internal Voltage Boosting Method)
• 1/3 bias method
VDD
VDD
VLC0
2/3 x VDD
VLC1
Drive voltage
generator
1/3 x VDD
VLC2
VLC3/P02^Note
CAPH
C1
CAPL
C2 C3
Note VLC3 can be used as port (P02).
Remark Use a capacitor with as little leakage as possible.
In addition, make C1 a nonpolar capacitor.
16.9 Selection of LCD Display Data
With the 78K0R/Lx3 microcontroller, to use the LCD display data memory when the number of time slices is static, two,
three, or four, the LCD display data can be selected from the following three types, according to the BLON and LCDSEL
bit settings.
• Displaying an A-pattern area data (lower four bits of LCD display data memory)
• Displaying a B-pattern area data (higher four bits of LCD display data memory)
• Alternately displaying A-pattern and B-pattern area data (blinking display corresponding to the constant-period interrupt
timing of the real-time counter (RTC))
Caution When the LCD display data memory is used when the number of time slices is eight, LCD display data
(A-pattern, B-pattern, or blinking display) cannot be selected.
16.9.1 A-pattern area and B-pattern area data display
When BLON = LCDSEL = 0, A-pattern area (lower four bits of the LCD display data memory) data will be output as the
LCD display data.
When BLON = 0, and LCDSEL = 1, B-pattern area (higher four bits of the LCD display data memory) data will be
output as the LCD display data.
Refer to 16.4 LCD Display Data Memory about the display area.
R01UH0004EJ0501 Rev.5.01
706
Jun 20, 2011