ml9289 Oki Semiconductor, ml9289 Datasheet - Page 19

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

3. “ADRAM data write” command
ADRAM (Additional Data RAM) has a 2-bit address to store symbol data.
Symbol data specified by ADRAM is directly output without CGROM and CGRAM.
(The ADRAM can store two types of symbol patterns for each digit.)
The terminal to which the contents of ADRAM are output can be used as a cursor.
[Command format]
To specify symbol data continuously to the next address, specify only symbol data as follows.
Since the address of ADRAM is automatically incremented, address specification is unnecessary.
[Relationship between ADRAM addresses setup and COM positions]
(Specifies the address of ADRAM and writes symbol data)
HEX
0
1
2
3
4
5
6
7
2nd byte
2nd byte
2nd byte
2nd byte
2nd byte
1st byte
(17th)
(18th)
(2nd)
(3rd)
(1st)
(4th)
X0
0
1
0
1
0
1
0
1
X0 (LSB) to X3 (MSB) : ADRAM address (4 bits: 16 characters worth)
C0 (LSB) to C1 (MSB) : Symbol data (2 bits: 2 symbols per digit)
LSB
LSB
LSB
LSB
LSB
LSB
C0 C1
C0 C1
C0 C1
C0 C1
C0 C1
B0 B1 B2 B3 B4 B5 B6 B7
X0 X1 X2 X3 1
B0 B1 B2 B3 B4 B5 B6 B7
B0 B1 B2 B3 B4 B5 B6 B7
B0 B1 B2 B3 B4 B5 B6 B7
B0 B1 B2 B3 B4 B5 B6 B7
B0 B1 B2 B3 B4 B5 B6 B7
X1
0
0
1
1
0
0
1
1
*
*
*
*
*
X2
0
0
0
0
1
1
1
1
*
*
*
*
*
X3
* : Don’t care
0
0
0
0
0
0
0
0
*
*
*
*
*
1
*
*
*
*
*
positions
0
*
*
*
*
*
COM1
COM2
COM3
COM4
COM5
COM6
COM7
COM8
COM
MSB
MSB
MSB
MSB
MSB
MSB
0
*
*
*
*
*
: Setup and DCRAM address in the write-in mode of
: Specify symbol data.
: Specify symbol data.
:
:
:
Specify symbol data.
(It is written into ADRAM address 2H.)
DCRAM data are specified.
(Example: Specify ADRAM address 0H.)
(Example: Specify ADRAM address 0H.)
(It is written into ADRAM address 1H.)
Specify symbol data.
(It is written into ADRAM address FH.)
Specify symbol data.
(It is rewritten into ADRAM address 0H.)
HEX
C
D
8
9
A
B
E
F
X0
0
1
0
1
0
1
0
1
X1
0
0
1
1
0
0
1
1
X2
0
0
0
0
1
1
1
1
X3
1
1
1
1
1
1
1
1
positions
COM10
COM11
COM12
COM13
COM14
COM15
COM16
COM9
COM
FEDL9289-01
ML9289-xx
19/31