E202075_HD404889 Datasheet, PDF (140/202 Pages) Renesas Technology Corp – Low-Voltage AS Microcomputers with On-Chip LCD Circuit

HD404889/HD404899/HD404878/HD404868 Series
V_CC
Internal LCD power supply switch
V₁
V₂
LCD display
V₃
control register
(LCR)
COM1
COM2
COM3
COM4
Common
signal
output
circuit
4 Pin control
Port mode
register 4
(PMR4)
SEG1 to SEG4
SEG5 to SEG8
SEG9 to SEG12
SEG13 to SEG16
Segment
signal
output
circuit
Display
2 control
24 ^{Display data}
2 Duty selection
Dual-port
display RAM
(24 digits)
Clock
SEG17 to SEG24
Selector
2
Note:
Data bus
Clock line
Signal line
LCD input clocks
Pin function switching circuit
LCD display
mode register
(LMR)
Figure 86-2 LCD Circuit Block Diagram (HD404868 Series)
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