ml9289 Oki Semiconductor, ml9289 Datasheet - Page 17

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

2. “CGRAM data write” command
CGRAM (Character Generator RAM) has a 4-bit address to store alphanumeric character patterns.
A character pattern stored in CGRAM can be displayed by specifying the character code (address) by DCRAM.
The addresses of CGRAM are assigned to 00H to 0FH (All the other addresses are the CGROM addresses).
The CGRAM can store 16 types of character patterns.
[Command format]
To specify character pattern data continuously to the next address, specify only character pattern data as follows.
Since the address of CGRAM is automatically incremented, address specification is unnecessary.
Data from the 2nd to 6th byte (character pattern) is regarded as one data item taken together, so 250ns s is
sufficient for t
(Specifies the address of CGRAM and writes character pattern data.)
2nd byte
3rd byte
1st byte
2nd byte
3rd byte
(2nd)
(3rd)
(1st)
(4th)
(5th)
DOFF
C0 (LSB) to C15 (MSB): Character data of CGRAM (16 bits: 16 outputs per digit)
X0 (LSB) to X3 (MSB): CGRAM address (4 bits: 16 characters worth)
LSB
LSB
LSB
B0 B1 B2 B3 B4 B5 B6 B7
X0 X1 X2 X3
B0 B1 B2 B3 B4 B5 B6 B7
C0 C1 C2 C3 C4 C5 C6 C7
B0 B1 B2 B3 B4 B5 B6 B7
C8 C9 C10 C11 C12 C13 C14C15
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
C8 C9 C10 C11 C12 C13 C14 C15
time between bytes.
0
1
0
MSB
MSB
MSB
MSB
MSB
0
: Setup and CGRAM address in the write-in
: Specify 1st-column data.
: Specify 2nd-column data.
:
:
Specify 2nd-column data.
(It is written into CGRAM address 01H.)
Specify 1st-column data.
(It is written into CGRAM address 01H.)
mode of CGRAM data are specified.
(Example: Specify CGRAM address 00H.)
(It is written into CGRAM address 00H.)
(It is written into CGRAM address 00H.)
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