HD66421 Datasheet, PDF (10/46 Pages) Hitachi Semiconductor – (RAM-Provided 160 Channel 4-Level Grey Scale Driver for Dot Matrix Graphics LCD)

Preliminary
Block Diagram
Rev. 1.1E '99.02.10
HD66421
COM1
COM50 SEG1
SEG160COM51
COM100
Row Driver
Level Shifter
Column Driver
Level Shifter
Row Driver
Level Shifter
160
Attribute
Grey scale selector
320
Data Latch2
320
Data Latch1
320
320 x 80bit
Display memory
X Decoder
Data Buffer
Comparator
Decoder
Row
Counter
Display Line
Counter
Grey scale
palette
X Address Counter
Y Address Counter
Blink Registers
Start Line Register
Blink Start Line Register
Blink End Line Register
Control Register
Contrast Control Register
MPX
Grey
scale
pattern
Generator
MPU Interface
LCD driver power supply,
Contrast control
I/O control
Timing
Generator
Oscillator
DB7
-DB0
WR CS
RS _RD
M/S
V1O V3O V5O
V2O V4O ^VLCD
FLM M CL1 DCON
RES OSC OSC2
OSC1 CO
5
10