UPD78F1502AGK-GAK-AX Datasheet, PDF (677/1031 Pages) Renesas Technology Corp – 16-Bit Single-Chip Microcontrollers

78K0R/Lx3
CHAPTER 16 LCD CONTROLLER/DRIVER
CHAPTER 16 LCD CONTROLLER/DRIVER
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Item
LCD
Controller/driver
78K0R/LF3
80 pins
Segment signal outputs: 31
Common signal outputs: 8
78K0R/LG3
100 pins
Segment signal outputs: 40
Common signal outputs: 8
78K0R/LH3
128 pins
Segment signal outputs: 54
Common signal outputs: 8
16.1 Functions of LCD Controller/Driver
The functions of the LCD controller/driver in the 78K0R/Lx3 microcontrollers are as follows.
(1) The LCD driver voltage generator can switch internal voltage boosting method, capacitor split method, and
external resistance division method.
(2) Automatic output of segment and common signals based on automatic display data memory read
(3) Six different display modes:
• Static
• 1/2 duty (1/2 bias)
• 1/3 duty (1/2 bias)
• 1/3 duty (1/3 bias)
• 1/4 duty (1/3 bias)
• 1/8 duty (1/4 bias)
(4) Six different frame frequencies, selectable in each display mode
(5) The reference voltage to be generated when operating the voltage boost circuit can be selected from 20 stages
(contrast adjustment).
(6) The data display of the LCD display data memory can be selected from three types.
• Displaying an A-pattern area (lower four bits)
• Displaying a B-pattern area (higher four bits)
• Alternately displaying A-pattern and B-pattern areas (blinking display corresponding to the constant-period
interrupt (INTRTC) timing of the real-time counter (RTC))
(7) 78K0R/LF3: Segment signal outputs: 31^Note (SEG0 to SEG30),
Common signal outputs: 8 ^Note (COM0 to COM7)
78K0R/LG3: Segment signal outputs: 40^Note (SEG0 to SEG39),
Common signal outputs: 8 ^Note (COM0 to COM7)
78K0R/LH3: Segment signal outputs: 54^Note (SEG0 to SEG53),
Common signal outputs: 8 ^Note (COM0 to COM7)
Note The four segment signal outputs (SEG0 to SEG3) and four common signal outputs (COM4 to COM7) are
alternate-function pins. COM4 to COM7 can be used only when eight-time-slice mode is selected by the setting
of the LCD display mode register (LCDM).
R01UH0004EJ0501 Rev.5.01
661
Jun 20, 2011