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Preliminary User’s Manual U14913EE1V0UM00
Chapter 15
LCD Controller/Driver
15.1 LCD
Controller/Driver
Functions
The functions of the LCD controller/driver incorporated in the µPD70F3123 subseries are shown below.
(1) Automatic output of segment signals and common signals is possible by automatic reading of the
display data memory.
(2) Display mode
- 1/4 duty (1/3 bias)
(3) Any of four frame frequencies can be selected in each display mode.
(4) Maximum of 40 segment signal outputs (S0 to S39); 4 common signal outputs (COM0 to COM3). All
segment outputs can be switched to input/output ports.
PAH7/S0 to PAH0/S7, PAL15/S8 to PAL0/S23 and PCS2/S24 to PCS4/S26 and PCT0/S27 to
PCT4/S31 and PCM0/S32 to PCM1/S33 and P60/S34 to P65/S39 are bitwise switchable.
(5) The operation with the subsystem clock is not available.
Table 15-1: Maximum Number of Display Pixels
15.2 LCD
Controller/Driver
Configuration
The LCD controller/driver consists of the following hardware.
Table 15-2: LCD Controller/Driver Configuration
Bias Method
Time Division
Common Signals Used
Maximum Number of Display Pixels
1/3
4
COM0 to COM3
160 (40 segments x 4 commons)
Item
Configuration
Display outputs
Segment signals: 40 Segment signal with alternate function: 40
Common signals: 4 (COM0 to COM3)
Control registers
LCD display mode register (LCDM)
LCD display control register (LCDC)
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