64CH Segment Driver For Dot Matrix LCD 20
3. Set Page (X Address)
X address (AC0~AC2) of the display data RAM is set in the X address register.
Writing or reading to or from MPU is executed in this specified page until the next page is set.
RS
0
R/W
0
DB7
1
DB6
0
DB5
1
DB4
1
DB3
1
DB2
AC2
DB1
AC1
DB0
AC0
4. Display Start Line (Z Address)
Z address (AC0~AC5) of the display data RAM is set in the display start line register and
displayed at the top of the screen.
When the display duty cycle is 1/64 or others (1/32~1/64), the data of total line number of
LCD screen, from the line specified by display start line instruction, is displayed.
RS
0
R/W
0
DB7
1
DB6
1
DB5
AC5
DB4
AC4
DB3
AC3
DB2
AC2
DB1
AC1
DB0
AC0
5. Status Read
RS
1
R/W
0
DB7
BUSY
DB6
0
DB5
ON/OFF
DB4
RESET
DB3
0
DB2
0
DB1
0
DB0
0
l
BUSY
When BUSY is 1, the Chip is executing internal operation and no instructions are
accepted.
When BUSY is 0, the Chip is ready to accept any instructions.
l
l
ON/OFF
When ON/OFF is 1, the display is on.
When ON/OFF is 0, the display is off.
RESET
When RESET is 1, the system is being initialized.
In this condition, no instructions except status read can be accepted.
When RESET is 0, initializing has finished and the system is in the usual operation
condition.
6. Write Display Data
Writes data (D0~D7) into the display data RAM.
After writing instruction, Y address is increased by 1 automatically.
RS
1
R/W
0
DB7
D7
DB6
D6
DB5
D5
DB4
D4
DB3
D3
DB2
D2
DB1
D1
DB0
D0
7. Read Display Data
Reads data (D0~D7) from the display data RAM.
After reading instruction, Y address is increased by 1 automatically.
RS
1
R/W
1
DB7
D7
DB6
D6
DB5
D5
DB4
D4
DB3
D3
DB2
D2
DB1
D1
DB0
D0
HB [ HB ELECTRONIC COMPONENTS ]
