ml9289 Oki Semiconductor, ml9289 Datasheet - Page 15

• Manufacturer Part Number: ml9289
• Description: Vacuum Fluorescent Display Tube Controller Driver
• Manufacturer: Oki Semiconductor

Description of Commands and Functions
1. “DCRAM data write” command
DCRAM (Data Control RAM) has a 4-bit address to store character codes of CGROM and CGRAM.
A character code specified by DCRAM is converted to an alphanumeric character pattern via CGROM or
CGRAM.
The DCRAM can store 16 characters worth of character codes.
[Command format]
To specify the character code of CGROM and CGRAM to the next address continuously, specify only character
code as follows.
Since the address of DCRAM is automatically incremented, address specification is unnecessary.
(Specifies the address of DCRAM and writes the character code of CGROM and CGRAM.)
2nd byte
1st byte
2nd byte
2nd byte
2nd byte
2nd byte
(2nd)
(1st)
(18th)
(17th)
(3rd)
(4th)
X0 (LSB) to X3 (MSB): DCRAM address (4 bits: 16 characters worth)
C0 (LSB) to C7 (MSB): Character code of CGROM and CGRAM (8 bits: 256 characters worth)
LSB
LSB
C0 C1 C2 C3 C4 C5 C6 C7
B0 B1 B2 B3 B4 B5 B6 B7
X0 X1 X2 X3 1
B0 B1 B2 B3 B4 B5 B6 B7
LSB
LSB
LSB
LSB
B0 B1 B2 B3 B4 B5 B6 B7
C0 C1 C2 C3 C4 C5 C6 C7
B0 B1 B2 B3 B4 B5 B6 B7
C0 C1 C2 C3 C4 C5 C6 C7
B0 B1 B2 B3 B4 B5 B6 B7
C0 C1 C2 C3 C4 C5 C6 C7
B0 B1 B2 B3 B4 B5 B6 B7
C0 C1 C2 C3 C4 C5 C6 C7
0
0
MSB
MSB
MSB
MSB
MSB
MSB
0
: Setup and DCRAM address in the write mode
: Specify character code of CGROM and CGRAM.
: Specify character code of CGROM and CGRAM.
: Specify character code of CGROM and CGRAM.
: Specify character code of CGROM and CGRAM.
: Specify character code of CGROM and CGRAM.
(It is written into DCRAM address 1H.)
(It is written into DCRAM address 2H.)
(It is written into DCRAM address FH.)
(It is rewritten into DCRAM address 0H.)
of DCRAM data are specified.
(Example: Specify DCRAM address 0H.)
(It is written into DCRAM address 00H.)
FEDL9289-01
ML9289-xx
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