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MB90420/5 (A) SERIES F
14.2 Configuration of LCD Controller/Driver
The LCD controller/driver consists of the 8 blocks shown below, and is divided functionally into 2 units: the
controller unit that generates segment signals and common signals according to display RAM data, and the
driver unit that drives the LCD.
• LCDC control register (LCRL/LCRH)
• Display RAM
• Prescaler
• Timing controller
• AC generator
• Common driver
• Segment driver
• Split resistors
„
Block diagram for LCD controller/driver
Time-base
timer output
2
MC-16LX FAMILY 16-BIT MICROCONTROLLERS HARDWARE MANUAL
LCDC control register L
(LCRL)
Timing
Prescaler
controller
Display RAM
16 × 8 bits
LCDC control register H
(LCRH)
Controller
Fig. 14.1 Block Diagram for LCD Controller/Driver
V0 V1 V2 V3
Split resistors
4
24
Driver
14-4
COM0
Common
COM1
driver
COM2
COM3
SEG0
SEG1
SEG2
SEG3
SEG4
Segment
:
driver
SEG18
SEG19
SEG20
SEG21
SEG22
SEG23
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