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13.1 LCD Controller/Driver Functions
The functions of the LCD controller/driver of the
(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)
16 to 28 segment signal outputs (S0 to S15, S16 to S27
4 common signal outputs (COM0 to COM3)
Note Usable mask option or port function register
(5)
Operation with subsystem clock is possible
(6)
On-chip voltage booster
The maximum number of displayable pixels is shown in Table 13-1 below.
Bias Method
Time Division
1/3
3
4
Notes 1. The LCD panel of the figure
2. The LCD panel of the figure
13.2 LCD Controller/Driver Configuration
The LCD controller/driver includes the following hardware.
Item
Display outputs
Segment signals: 16 to 28
Common signals:
Control registers
LCD display mode register 0 (LCDM0)
LCD clock control register 0 (LCDC0)
LCD voltage boost control register 0 (LCDVA0)
250
CHAPTER 13 LCD CONTROLLER/DRIVER
µ
PD789489 Subseries are as follows.
Table 13-1. Maximum Number of Display Pixels
Common Signals
Used
COM0 to COM2
COM0 to COM3
consists of 9 rows with 3 segments per row.
consists of 14 rows with 2 segments per row.
Table 13-2. Configuration of LCD Controller/Driver
4 (COM0 to COM3)
User's Manual U15331EJ4V1UD
Note
)
Maximum Number
Maximum Number of Display Pixels
of Segments
84 (28 segments × 3 commons)
28
112 (28 segments × 4 commons)
Configuration
Note 1
Note 2
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