SSD1854Z datasheet(13/48 Pages) ETC

13 / 48 page

SSD1854

Series

Rev 1.0

08/2002

SOLOMON

PIN DESCRIPTION

6.1

RES

This pin is reset signal input. When the pin is low, initialization of the chip is executed.

6.2

PS0-2

These 3 pins use together to determine the interface protocol between the driver and MCU according

to the following table.

Table 3 - PS0-2 Interface

PS0

PS1

PS2

Interface

3-wire SPI (write only)

4-wire SPI (write only)

8080 parallel interface (8-bits read and 16-bits write)

8080 parallel interface (8-bits read and 8-bits write)

6800 parallel interface (8-bits read and 16-bits write)

6800 parallel interface (8-bits read and 8-bits write)

6.3

This pin is chip select input. The chip is enabled for display data/command transfer only when CS is

low.

For 6800-series parallel mode, when E pin is pulled high, the read/write cycle is initiated by pulling low

of this CS pin.

6.4

D/ C

This input pin is to identify display data/command cycle. When the pin is high, the data written to the

driver will be written into display RAM. When the pin is low, the data will be interpreted as command.

This pin must be connected to VSS when 3-lines SPI interface is used.

6.5

R/W ( WR )

This pin is microprocessor interface signal. When interfacing to an 6800-series microprocessor, the

signal indicates read mode when high and write mode when low. When interfacing to an 8080-

microprocessor, a data write operation is initiated when R/W( WR ) is low and the chip is selected.

6.6

E( RD )

This pin is microprocessor interface signal. When interfacing to an 6800-series microprocessor, a data

operation is initiated when E( RD ) is high and the chip is selected. When interfacing to an 8080-

microprocessor, a data read operation is initiated when E( RD ) is low and the chip is selected.

6.7

D0 -D15

D0-D7 are bi-directional and D8-D15 are input only data pins to be connected to the microprocessor’s

data bus. When serial mode is selected, D7 is the serial data input SDA and D6 is the serial clock input

SCK. All unused data pins must be connected to ground.

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