MTV048 データシートの表示（PDF） - Unspecified

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MTV048

On-Screen-Display Controller for CRT/LCD Monitor

Unspecified 

MYSON

TECHNOLOGY

MTV048

(Rev 0.9)

SCK

SDA

B7

START

B6

first byte

B0

B7

ACK

second byte

B0

ACK

last byte

STOP

FIGURE 2. Data Transmission Protocol (I2C)

There are three transmission formats for I2C write mode, shown as below:

Format (a) S - R - C - D → R - C - D → R - C - D … ..

Format (b) S - R - C - D → C - D → C - D → C - D … ..

Format (c) S - R - C - D → D → D → D → D → D … ..

Where S=Slave address, R=Row address, C=Column address, D=Display data

Each arbitrary length of data packet consists of 3 portions viz, Row address (R), Column address (C), and

Display data (D). Format (a) is suitable for updating small amount of data, which will be allocated with a

different row address and column address. Format (b) is recommended for updating data that has the same

row address but a different column address. Massive data updating or full screen data change should use

format (c) to increase transmission efficiency. The row and column address will be incremented

automatically when the format (c) is applied. Furthermore, the undefined locations in display or user fonts

RAM should be filled with dummy data.

TABLE 1. The Configuration of Transmission Formats

Address b7 b6 b5 b4 b3 b2 b1 b0 Format

Row

1

0

0 R4 R3 R2 R1 R0 a,b,c

Address Bytes Columnab 0

0 D8 C4 C3 C2 C1 C0

of Display Reg. Columnc 0

1 D8 C4 C3 C2 C1 C0

Data D7 D6 D5 D4 D3 D2 D1 D0

a,b

c

a,b,c

Row

1

0

1 R4 R3 R2 R1 R0 a,b,c

Attribute Bytes Columnab 0

0

x C4 C3 C2 C1 C0

of Display Reg. Columnc 0

1

x C4 C3 C2 C1 C0

Data D7 D6 D5 D4 D3 D2 D1 D0

a,b

c

a,b,c

Row

1

1

-

-

-

R2 R1 R0 a,b,c

User Fonts Columnab 0

0 C5 C4 C3 C2 C1 C0

Columnc 0

1 C5 C4 C3 C2 C1 C0

Data D7 D6 D5 D4 D3 D2 D1 D0

a,b

c

a,b,c

There are 3 types of data, which should be accessed through the serial data interface. One is ADDRESS

bytes of display registers, another is ATTRIBUTE bytes of display registers, and the other is user fonts

RAM data. The protocols are all the same except the bit6 and bit5 of row address and the bit5 of column

address. The MSB (b7) is used to distinguish row and column addresses when transferring data from

external controller. The bit6 of row address is used to distinguish display registers and user fonts RAM data

and the bit6 of column address is used to differentiate the column address for format (a), (b) and format (c)

respectively. Bit5 of row address for display register is used to distinguish ADDRESS byte when it is set to

"0" and ATTRIBUTE byte when it is set to "1". And at address bytes, bit5 of column address is the MSB

(bit8) and data bytes are the 8 LSB (bit7~bit0) of display fonts address to save half MCU memory for

true 392 fonts display. So each one of the 384 fonts can be displayed at the same time. See Table 1. And for

format (c), since D8 is filled while program column address of address bytes, the continued data will be the

same bank of upper 128 fonts or lower 256 fonts until program column address is of address bytes again.

Rev 0.9

-4-

2001/03/15

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