User’s Manual
U15075EJ2V1UD
251
CHAPTER 13 LCD CONTROLLER/DRIVER
13.1 LCD Controller/Driver Functions
The functions of the LCD controller/driver of the
µ
PD789426, 789436, 789446, and 789456 Subseries are as
follows.
(1) Automatic output of segment and common signals based on automatic display data memory read
(2) Two different display modes:
• 1/3 duty (1/3 bias)
• 1/4 duty (1/3 bias)
(3) Four different frame frequencies, selectable in each display mode
(4) Operation with a subsystem clock
Table 13-1 lists the maximum number of pixels that can be displayed in each display mode.
Table 13-1. Number of Segment Outputs and Maximum Number of Pixels
Bias Method Time Slots
Common Signals
Used
Maximum Number
of Segments
Maximum Number of Pixels
3
COM0 to COM2
15 (5 segments
×
3 commons)
µ
PD789426, 789436
Subseries
4
COM0 to COM3
5
20 (5 segments
×
4 commons)
3
COM0 to COM2
45 (15 segments
×
3 commons)
µ
PD789446, 789456
Subseries
1/3
4
COM0 to COM3
15
60 (15 segments
×
4 commons)
13.2 LCD Controller/Driver Configuration
The LCD controller/driver includes the following hardware.
Table 13-2. Configuration of LCD Controller/Driver
Item Configuration
Display outputs
Segment signals: 5 (
µ
PD789426 and 789436 Subseries)
15
(
µ
PD789446 and 789456 Subseries)
Common signals: 4 (COM0 to COM3)
Control registers
LCD display mode register 0 (LCDM0)
LCD clock control register 0 (LCDC0)
LCD voltage amplification control register 0 (LCDVA0)
Содержание U789436 Series
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