MTV118 Ver la hoja de datos (PDF) - Myson Century Inc

Número de pieza

componentes Descripción

Fabricante

MTV118

On-Screen-Display for LCD Monitor

Myson Century Inc 

MYSON

TECHNOLOGY

MTV118

SSB

SCK

SDA

MS

B

first byte

LSB

last byte

FIGURE 1. Data Transmission Protocol (SPI)

3.1.2 I2C Bus

I2C bus operation is only selected when the SSB pin is left floating. A valid transmission should begin

from writing the slave address 7AH, which is mask option, to MTV118. The protocol is shown in Figure

2 on page 4..

SCK

SDA

START

B7 B6

first byte

B0

B7

B0

ACK

¡@¡@¡@¡@

¡@

second byte

last byte

ACK

FIGURE 2. Data Transmission Protocol (I2C)

STOP

There are 3 transmission formats as shown 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

S=slave address, R=row address, C=column address, D=display data

Each arbitrary length of data packet consists of 3 portions: row address (R), column address (C) and

display data (D). Format (a) is suitable for updating small amounts of data which will be allocated with

different row and column addresses. 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 changes should

be done in format (c) to increase transmission efficiency. The row and column addresses will be incre-

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

RAM should be filled with dummy data.

There are 3 types of data which should be accessed through the serial data interface: address bytes of

display registers, attribute bytes of display registers and user font RAM data. The protocol is the same

for all except bits 5 and 6 of the row addresses. The MSB(b7) is used to distinguish row and column

addresses when transferring data from an external controller. Bit 6 of the row address is used to distin-

guish display registers and user font RAM data and bit6 of the column address is used to differentiate

the column address for formats (a), (b) and (c), respectively. Bit 5 of the row address for display regis-

ters is used to distinguish the address byte when it is set to "0" and the attribute byte when it is set to

"1". The configuration of transmission formats is shown in Table 1 on page 5.

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MTV118 Revision 2.0 01/01/1999

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