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MTV118 Revision 2.0 01/01/1999

MTV118

MYSON

TECHNOLOGY

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

2 on page 4..

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.

MS

B

LSB

SSB

SCK

SDA

first byte

last byte

FIGURE 1. Data Transmission Protocol (SPI)

SCK

SDA

first byte

¡@¡@¡@¡@

¡@

START

ACK

second byte

last byte

ACK

STOP

B7

B6

B0

B7

B0