ML9209 データシートの表示（PDF） - LAPIS Semiconductor Co., Ltd.

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コンポーネント説明

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ML9209

Vacuum fluorescent display tube controller driver

LAPIS Semiconductor Co., Ltd. 

LAPIS Semiconductor

FEDL9209-01

ML9209-xx

2. “CGRAM data write” command

(Specifies the address of CGRAM and writes character pattern data.)

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]

LSB

MSB

B0 B1 B2 B3 B4 B5 B6 B7

1st byte X0 X1 X2 X3 0 1 0 0 : Setup and CGRAM address in the write-in

(1st)

mode of CGRAM data are specified.

LSB

MSB (Example: Specify CGRAM address 00H.)

B0 B1 B2 B3 B4 B5 B6 B7

2nd byte C0 C1 C2 C3 C4 C5 C6 C7 : Specify 1st-column data.

(2nd)

(It is written into CGRAM address 00H.)

LSB

MSB

B0 B1 B2 B3 B4 B5 B6 B7

3rd byte C8 C9 C10C11C12C13C14C15 : Specify 2nd-column data.

(3rd)

(It is written into CGRAM address 00H.)

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 250 ns is

sufficient for tDOFF time between bytes.

LSB

MSB

B0 B1 B2 B3 B4 B5 B6 B7

2nd byte C0 C1 C2 C3 C4 C5 C6 C7 : Specify 1st-column data.

(4th)

(It is written into CGRAM address 01H.)

LSB

MSB

B0 B1 B2 B3 B4 B5 B6 B7

3rd byte C8 C9 C10C11C12C13C14C15 : Specify 2nd-column data.

(5th)

(It is written into CGRAM address 01H.)

X0 (LSB) to X3 (MSB): CGRAM address (4 bits: 16 characters worth)

C0 (LSB) to C15 (MSB): Character data of CGRAM (16 bits: 16 outputs per digit)

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