UPD780973 Datasheet, PDF (190/301 Pages) NEC – 8-Bit Single-Chip Microcontrollers

CHAPTER 16 LCD CONTROLLER/DRIVER
16.2 LCD Controller/Driver Configuration
The LCD controller/driver consists of the following hardware.
Table 16-2. LCD Controller/Driver Configuration
Item
Display outputs
Control registers
Configuration
Segment signals : 20 Dedicated segment signals: 5
Segment signal/input/output port alternate function: 14
Segment signal/input/output port/16-bit timer prescaler output alternate
function: 1
Common signals : 4 (COM0 to COM3)
LCD display mode register (LCDM)
LCD display control register (LCDC)
Figure 16-1. LCD Controller/Driver Block Diagram
Internal bus
Display data memory
FA6CH
76543210
FA68H
FA67H
76543210 76543210
LCD display mode register (LCDM)
LCD display control register (LCDC)
FA59H
76543210
LCDON LCDM6 LCDM5 LCDM4
LCDC7 LCDC6 LCDC5 LCDC4 LIPS
3
4
LCD clock selector
3210
selector
………
3210
selector
3210
selector
………
3210
selector
fLCD
Timing controller
………
………
Segment selector
Note …………… Note
Note ………
Note
P97 output
buffer
P81 output
buffer
Common driver
S0 ……………… S4
Note Segment driver
S5/P97 ……… S19/P81 COM0 COM1 COM2 COM3
LCD driver voltage controller
VLCD
190