H8S Family
LCD Display Using 1/4 Duty Drive (LCD Controller/Driver)
REJ06B0486-0100/Rev.1.00
March 2005
Page 4 of 19
(2) Block Diagram of LCD Controller/Driver
A block diagram of the LCD controller/driver used in this sample task is shown in figure 2.
[Legend]
LPCR: LCD port control register
LCR: LCD control register
LCR2: LCD control register 2
LCD drive power
supply (built-in
step-up voltage
circuit)
Common
driver
Common
data latch
Segment
driver
40-bit
shift register
LPCR
LCR
LCR2
Display timing
generator
LCD RAM
20 bytes
Selector
φ
/16 to
φ
/2048
φ
sub to
φ
sub/4
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
LCD controller/
driver function settings
Display data
LCD controller/driver
SEG1
SEG40
COM4
COM1
Vss
V3
V2
V1
Vcc
Figure 2 Block Diagram of LCD Controller/Driver
