HD404849 Datasheet, PDF (98/125 Pages) Hitachi Semiconductor – 4-Bit Single-Chip Microcomputer

V_CC
LCD power switch
HD404849 Series
V1
V2
V3
GND
COM1
COM2
COM3
COM4
R6₀/SEG13
R6₁/SEG14
R7₃/SEG20
SEG21
SEG43
SEG44
LCD
power
control
circuit
LCD
control register
(LCR)
LCD
common
driver
LCD
output register 3
(LCR3)
LCD
segment
driver
2 Pin control
Display
2 control
32 Display data
2 Duty cycle selection
Display
dual-port
RAM
(32 digits)
2
Selector
LCD input clock
LCD
mode register
(LMR)
Figure 84 Block Diagram of LCD Controller/Driver
98