Lcd Controller/Driver Configuration - NEC mPD780852 Series Preliminary User's Manual

16.2 LCD Controller/Driver Configuration

The LCD controller/driver consists of the following hardware.
Item
Display outputs Segment signals: 20
Common signals: 4 (COM0 to COM3)
Control registers LCD display mode register (LCDM)
LCD display control register (LCDC)
Display data memory
FA6CH FA68H
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
3 2 1 0 3 2 1 0
.........
Selector Selector
.........
...............
Note
..................
S0
Note Segment driver
208
CHAPTER 16 LCD CONTROLLER/DRIVER
Table 16-2. LCD Controller/Driver Configuration
Dedicated segment signals: 5
Segment signal/input or output port alternate function: 14
Segment signal/input or output port/16-bit timer prescaler output alternate function: 1
Figure 16-1. LCD Controller/Driver Block Diagram
LCD display mode register (LCDM)
FA67H FA59H
7 6 5 4 3 2 1 0 7 6 5 4 3 2 1 0
3 2 1 0 3 2 1 0
.........
Selector Selector
.........
.........
Note Note Note
P97 output P81 output
buffer buffer
.........
S4 S5/P97 S19/P81
Preliminary User's Manual U14581EJ3V0UM00
Configuration
Internal bus
LCD display control register (LCDC)
LCDON LCDM6 LCDM5 LCDM4
3
LCD clock selector
f
LCD
Timing controller
Segment selector
Common driver LCD driver voltage controller
COM0 COM1 COM2 COM3
LCDC7 LCDC6 LCDC5 LCDC4 LIPS
4
V
LCD