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SC802B
VER2.1
AKIHABARA INC.
Page 7 of 7
b) Block Diagram
IR
I/O
B
U
F
F
E
R
LCD
Driving Circuit
P TO S registor
BUSY
FLAG
DR
CG RAM
CG
RAM
Cursor
and
blink
CKT.
COM
Driving
Circuit
DD RAM
AC
Timing Control Circuit
D
E
C
O
D
E
R
RS
R/W
E
D0-D3
D4-D7
VDD
VO
VSS
a. Data Register (DR): Dris a register used for temporary Storage of the data read/write form/into DD
RAM and CG RAM.
b. Instruction Register (IR): is a register available for storing the instruction codes and address
information of display data (DD) RAM and character generator (CG) RAM.
c. BUSY FLAG (BF): When the Busy Flag is “1”,it shows that LCM is in internal operation and it can
not accept the next instruction.
d. Character Generator (CG) ROM: This ROM Generates character pattern from 8-bit character code
and provides 192 character patterns.
e. Character Generator (CG)RAM: This RAM allows the user to rewrite the character patterns freely
according to the program.
f.
Address Counter (AC): This address counter is used to give the address information of DD RAM
and CG RAM.
g. Display Data (DD) RAM: This display data RAM is used to store the display data expressed by 8-bit
character code . The capacity is 80x 8bits and data for 80 characters can be storage.
h. Cursor and Blink Control Circuit: This circuit generates the cursor and blink.
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